feat(India): Multiple GST enhancement and fixes (#25249)

* fix: RCM tax calculation

* feat(India): ITC Reversal via Journal Entry

* fix: Reverse Charge booking logic and validation

* fix: Addd patch for availed ITC fields

* fix: Hooks method to update availed ITC field

* fix: Cleanup and fixes in GSTR3B report

* fix: Update params in GSTR-1 report

* fix: Debit note using Sales Invoice

* fix: Setup and patch

* fix: GSTR 3B report cleanup and updates

* fix: Add method to get invoices liable to reverse charge

* fix: Add taxable value in Purchase Invoice Item

* fix: Inward supplies liable to reverse charge

* fix: Linting issues

* fix: GSTR3B report test
diff --git a/erpnext/accounts/doctype/gst_account/gst_account.json b/erpnext/accounts/doctype/gst_account/gst_account.json
index 7067338..b6ec884 100644
--- a/erpnext/accounts/doctype/gst_account/gst_account.json
+++ b/erpnext/accounts/doctype/gst_account/gst_account.json
@@ -1,196 +1,82 @@
 {
- "allow_copy": 0, 
- "allow_guest_to_view": 0, 
- "allow_import": 0, 
- "allow_rename": 0, 
- "beta": 0, 
- "creation": "2018-01-02 15:48:58.768352", 
- "custom": 0, 
- "docstatus": 0, 
- "doctype": "DocType", 
- "document_type": "", 
- "editable_grid": 1, 
- "engine": "InnoDB", 
+ "actions": [],
+ "creation": "2018-01-02 15:48:58.768352",
+ "doctype": "DocType",
+ "editable_grid": 1,
+ "engine": "InnoDB",
+ "field_order": [
+  "company",
+  "cgst_account",
+  "sgst_account",
+  "igst_account",
+  "cess_account",
+  "is_reverse_charge_account"
+ ],
  "fields": [
   {
-   "allow_bulk_edit": 0, 
-   "allow_on_submit": 0, 
-   "bold": 0, 
-   "collapsible": 0, 
-   "columns": 0, 
-   "fieldname": "company", 
-   "fieldtype": "Link", 
-   "hidden": 0, 
-   "ignore_user_permissions": 0, 
-   "ignore_xss_filter": 0, 
-   "in_filter": 0, 
-   "in_global_search": 0, 
-   "in_list_view": 1, 
-   "in_standard_filter": 0, 
-   "label": "Company", 
-   "length": 0, 
-   "no_copy": 0, 
-   "options": "Company", 
-   "permlevel": 0, 
-   "precision": "", 
-   "print_hide": 0, 
-   "print_hide_if_no_value": 0, 
-   "read_only": 0, 
-   "remember_last_selected_value": 0, 
-   "report_hide": 0, 
-   "reqd": 1, 
-   "search_index": 0, 
-   "set_only_once": 0, 
-   "unique": 0
-  }, 
+   "columns": 1,
+   "fieldname": "company",
+   "fieldtype": "Link",
+   "in_list_view": 1,
+   "label": "Company",
+   "options": "Company",
+   "reqd": 1
+  },
   {
-   "allow_bulk_edit": 0, 
-   "allow_on_submit": 0, 
-   "bold": 0, 
-   "collapsible": 0, 
-   "columns": 0, 
-   "fieldname": "cgst_account", 
-   "fieldtype": "Link", 
-   "hidden": 0, 
-   "ignore_user_permissions": 0, 
-   "ignore_xss_filter": 0, 
-   "in_filter": 0, 
-   "in_global_search": 0, 
-   "in_list_view": 1, 
-   "in_standard_filter": 0, 
-   "label": "CGST Account", 
-   "length": 0, 
-   "no_copy": 0, 
-   "options": "Account", 
-   "permlevel": 0, 
-   "precision": "", 
-   "print_hide": 0, 
-   "print_hide_if_no_value": 0, 
-   "read_only": 0, 
-   "remember_last_selected_value": 0, 
-   "report_hide": 0, 
-   "reqd": 1, 
-   "search_index": 0, 
-   "set_only_once": 0, 
-   "unique": 0
-  }, 
+   "columns": 2,
+   "fieldname": "cgst_account",
+   "fieldtype": "Link",
+   "in_list_view": 1,
+   "label": "CGST Account",
+   "options": "Account",
+   "reqd": 1
+  },
   {
-   "allow_bulk_edit": 0, 
-   "allow_on_submit": 0, 
-   "bold": 0, 
-   "collapsible": 0, 
-   "columns": 0, 
-   "fieldname": "sgst_account", 
-   "fieldtype": "Link", 
-   "hidden": 0, 
-   "ignore_user_permissions": 0, 
-   "ignore_xss_filter": 0, 
-   "in_filter": 0, 
-   "in_global_search": 0, 
-   "in_list_view": 1, 
-   "in_standard_filter": 0, 
-   "label": "SGST Account", 
-   "length": 0, 
-   "no_copy": 0, 
-   "options": "Account", 
-   "permlevel": 0, 
-   "precision": "", 
-   "print_hide": 0, 
-   "print_hide_if_no_value": 0, 
-   "read_only": 0, 
-   "remember_last_selected_value": 0, 
-   "report_hide": 0, 
-   "reqd": 1, 
-   "search_index": 0, 
-   "set_only_once": 0, 
-   "unique": 0
-  }, 
+   "columns": 2,
+   "fieldname": "sgst_account",
+   "fieldtype": "Link",
+   "in_list_view": 1,
+   "label": "SGST Account",
+   "options": "Account",
+   "reqd": 1
+  },
   {
-   "allow_bulk_edit": 0, 
-   "allow_on_submit": 0, 
-   "bold": 0, 
-   "collapsible": 0, 
-   "columns": 0, 
-   "fieldname": "igst_account", 
-   "fieldtype": "Link", 
-   "hidden": 0, 
-   "ignore_user_permissions": 0, 
-   "ignore_xss_filter": 0, 
-   "in_filter": 0, 
-   "in_global_search": 0, 
-   "in_list_view": 1, 
-   "in_standard_filter": 0, 
-   "label": "IGST Account", 
-   "length": 0, 
-   "no_copy": 0, 
-   "options": "Account", 
-   "permlevel": 0, 
-   "precision": "", 
-   "print_hide": 0, 
-   "print_hide_if_no_value": 0, 
-   "read_only": 0, 
-   "remember_last_selected_value": 0, 
-   "report_hide": 0, 
-   "reqd": 1, 
-   "search_index": 0, 
-   "set_only_once": 0, 
-   "unique": 0
-  }, 
+   "columns": 2,
+   "fieldname": "igst_account",
+   "fieldtype": "Link",
+   "in_list_view": 1,
+   "label": "IGST Account",
+   "options": "Account",
+   "reqd": 1
+  },
   {
-   "allow_bulk_edit": 0, 
-   "allow_on_submit": 0, 
-   "bold": 0, 
-   "collapsible": 0, 
-   "columns": 0, 
-   "fieldname": "cess_account", 
-   "fieldtype": "Link", 
-   "hidden": 0, 
-   "ignore_user_permissions": 0, 
-   "ignore_xss_filter": 0, 
-   "in_filter": 0, 
-   "in_global_search": 0, 
-   "in_list_view": 1, 
-   "in_standard_filter": 0, 
-   "label": "CESS Account", 
-   "length": 0, 
-   "no_copy": 0, 
-   "options": "Account", 
-   "permlevel": 0, 
-   "precision": "", 
-   "print_hide": 0, 
-   "print_hide_if_no_value": 0, 
-   "read_only": 0, 
-   "remember_last_selected_value": 0, 
-   "report_hide": 0, 
-   "reqd": 0, 
-   "search_index": 0, 
-   "set_only_once": 0, 
-   "unique": 0
+   "columns": 2,
+   "fieldname": "cess_account",
+   "fieldtype": "Link",
+   "in_list_view": 1,
+   "label": "CESS Account",
+   "options": "Account"
+  },
+  {
+   "columns": 1,
+   "default": "0",
+   "fieldname": "is_reverse_charge_account",
+   "fieldtype": "Check",
+   "in_list_view": 1,
+   "label": "Is Reverse Charge Account"
   }
- ], 
- "has_web_view": 0, 
- "hide_heading": 0, 
- "hide_toolbar": 0, 
- "idx": 0, 
- "image_view": 0, 
- "in_create": 0, 
- "is_submittable": 0, 
- "issingle": 0, 
- "istable": 1, 
- "max_attachments": 0, 
- "modified": "2018-01-02 15:52:22.335988", 
- "modified_by": "Administrator", 
- "module": "Accounts", 
- "name": "GST Account", 
- "name_case": "", 
- "owner": "Administrator", 
- "permissions": [], 
- "quick_entry": 1, 
- "read_only": 0, 
- "read_only_onload": 0, 
- "show_name_in_global_search": 0, 
- "sort_field": "modified", 
- "sort_order": "DESC", 
- "track_changes": 1, 
- "track_seen": 0
+ ],
+ "index_web_pages_for_search": 1,
+ "istable": 1,
+ "links": [],
+ "modified": "2021-04-09 12:30:25.889993",
+ "modified_by": "Administrator",
+ "module": "Accounts",
+ "name": "GST Account",
+ "owner": "Administrator",
+ "permissions": [],
+ "quick_entry": 1,
+ "sort_field": "modified",
+ "sort_order": "DESC",
+ "track_changes": 1
 }
\ No newline at end of file
diff --git a/erpnext/accounts/doctype/sales_invoice/sales_invoice.js b/erpnext/accounts/doctype/sales_invoice/sales_invoice.js
index 7c73ad6..5538568 100644
--- a/erpnext/accounts/doctype/sales_invoice/sales_invoice.js
+++ b/erpnext/accounts/doctype/sales_invoice/sales_invoice.js
@@ -582,6 +582,16 @@
 			};
 		});
 
+		frm.set_query("adjustment_against", function() {
+			return {
+				filters: {
+					company: frm.doc.company,
+					customer: frm.doc.customer,
+					docstatus: 1
+				}
+			};
+		});
+
 		frm.custom_make_buttons = {
 			'Delivery Note': 'Delivery',
 			'Sales Invoice': 'Return / Credit Note',
@@ -867,6 +877,10 @@
 			})
 		}
 
+		if (frm.doc.is_debit_note) {
+			frm.set_df_property('return_against', 'label', 'Adjustment Against');
+		}
+
 		if (frappe.boot.active_domains.includes("Healthcare")) {
 			frm.set_df_property("patient", "hidden", 0);
 			frm.set_df_property("patient_name", "hidden", 0);
diff --git a/erpnext/accounts/doctype/sales_invoice/sales_invoice.json b/erpnext/accounts/doctype/sales_invoice/sales_invoice.json
index c6c67b4..7ae2089 100644
--- a/erpnext/accounts/doctype/sales_invoice/sales_invoice.json
+++ b/erpnext/accounts/doctype/sales_invoice/sales_invoice.json
@@ -16,6 +16,7 @@
   "is_pos",
   "is_consolidated",
   "is_return",
+  "is_debit_note",
   "update_billed_amount_in_sales_order",
   "column_break1",
   "company",
@@ -392,7 +393,7 @@
    "read_only": 1
   },
   {
-   "depends_on": "return_against",
+   "depends_on": "eval:doc.return_against || doc.is_debit_note",
    "fieldname": "return_against",
    "fieldtype": "Link",
    "hide_days": 1,
@@ -401,7 +402,7 @@
    "no_copy": 1,
    "options": "Sales Invoice",
    "print_hide": 1,
-   "read_only": 1,
+   "read_only_depends_on": "eval:doc.is_return",
    "search_index": 1
   },
   {
@@ -1953,6 +1954,12 @@
   },
   {
    "default": "0",
+   "fieldname": "is_debit_note",
+   "fieldtype": "Check",
+   "label": "Is Debit Note"
+  },
+  {
+   "default": 0,
    "depends_on": "grand_total",
    "fieldname": "disable_rounded_total",
    "fieldtype": "Check",
@@ -1969,7 +1976,7 @@
    "link_fieldname": "consolidated_invoice"
   }
  ],
- "modified": "2021-04-15 23:57:58.766651",
+ "modified": "2021-04-23 22:36:32.916354",
  "modified_by": "Administrator",
  "module": "Accounts",
  "name": "Sales Invoice",
diff --git a/erpnext/hooks.py b/erpnext/hooks.py
index 2a70f2b..55169df 100644
--- a/erpnext/hooks.py
+++ b/erpnext/hooks.py
@@ -268,10 +268,12 @@
 	},
 	"Purchase Invoice": {
 		"validate": [
-			"erpnext.regional.india.utils.update_grand_total_for_rcm",
+			"erpnext.regional.india.utils.validate_reverse_charge_transaction",
+			"erpnext.regional.india.utils.update_itc_availed_fields",
 			"erpnext.regional.united_arab_emirates.utils.update_grand_total_for_rcm",
-			"erpnext.regional.united_arab_emirates.utils.validate_returns"
-			]
+			"erpnext.regional.united_arab_emirates.utils.validate_returns",
+			"erpnext.regional.india.utils.update_taxable_values"
+		]
 	},
 	"Payment Entry": {
 		"on_submit": ["erpnext.regional.create_transaction_log", "erpnext.accounts.doctype.payment_request.payment_request.update_payment_req_status", "erpnext.accounts.doctype.dunning.dunning.resolve_dunning"],
@@ -423,7 +425,6 @@
 		'erpnext.controllers.taxes_and_totals.get_regional_round_off_accounts': 'erpnext.regional.india.utils.get_regional_round_off_accounts',
 		'erpnext.hr.utils.calculate_annual_eligible_hra_exemption': 'erpnext.regional.india.utils.calculate_annual_eligible_hra_exemption',
 		'erpnext.hr.utils.calculate_hra_exemption_for_period': 'erpnext.regional.india.utils.calculate_hra_exemption_for_period',
-		'erpnext.accounts.doctype.purchase_invoice.purchase_invoice.make_regional_gl_entries': 'erpnext.regional.india.utils.make_regional_gl_entries',
 		'erpnext.controllers.accounts_controller.validate_einvoice_fields': 'erpnext.regional.india.e_invoice.utils.validate_einvoice_fields',
 		'erpnext.assets.doctype.asset.asset.get_depreciation_amount': 'erpnext.regional.india.utils.get_depreciation_amount'
 	},
diff --git a/erpnext/patches.txt b/erpnext/patches.txt
index 82d223c..9b3ddd0 100644
--- a/erpnext/patches.txt
+++ b/erpnext/patches.txt
@@ -769,6 +769,7 @@
 erpnext.patches.v12_0.create_taxable_value_field
 erpnext.patches.v12_0.add_gst_category_in_delivery_note
 erpnext.patches.v12_0.purchase_receipt_status
+erpnext.patches.v12_0.create_itc_reversal_custom_fields
 erpnext.patches.v13_0.fix_non_unique_represents_company
 erpnext.patches.v12_0.add_document_type_field_for_italy_einvoicing
 erpnext.patches.v13_0.make_non_standard_user_type #13-04-2021
diff --git a/erpnext/patches/v12_0/create_itc_reversal_custom_fields.py b/erpnext/patches/v12_0/create_itc_reversal_custom_fields.py
new file mode 100644
index 0000000..0078a53
--- /dev/null
+++ b/erpnext/patches/v12_0/create_itc_reversal_custom_fields.py
@@ -0,0 +1,115 @@
+from __future__ import unicode_literals
+import frappe
+from frappe.custom.doctype.custom_field.custom_field import create_custom_fields
+from frappe.custom.doctype.property_setter.property_setter import make_property_setter
+from erpnext.regional.india.utils import get_gst_accounts
+
+def execute():
+	company = frappe.get_all('Company', filters = {'country': 'India'}, fields=['name'])
+	if not company:
+		return
+
+	frappe.reload_doc("regional", "doctype", "gst_settings")
+	frappe.reload_doc("accounts", "doctype", "gst_account")
+
+	journal_entry_types = frappe.get_meta("Journal Entry").get_options("voucher_type").split("\n") + ['Reversal Of ITC']
+	make_property_setter('Journal Entry', 'voucher_type', 'options', '\n'.join(journal_entry_types), '')
+
+	custom_fields = {
+		'Journal Entry': [
+			dict(fieldname='reversal_type', label='Reversal Type',
+				fieldtype='Select', insert_after='voucher_type', print_hide=1,
+				options="As per rules 42 & 43 of CGST Rules\nOthers",
+				depends_on="eval:doc.voucher_type=='Reversal Of ITC'",
+				mandatory_depends_on="eval:doc.voucher_type=='Reversal Of ITC'"),
+			dict(fieldname='company_address', label='Company Address',
+				fieldtype='Link', options='Address', insert_after='reversal_type',
+				print_hide=1, depends_on="eval:doc.voucher_type=='Reversal Of ITC'",
+				mandatory_depends_on="eval:doc.voucher_type=='Reversal Of ITC'"),
+			dict(fieldname='company_gstin', label='Company GSTIN',
+				fieldtype='Data', read_only=1, insert_after='company_address', print_hide=1,
+				fetch_from='company_address.gstin',
+				depends_on="eval:doc.voucher_type=='Reversal Of ITC'",
+				mandatory_depends_on="eval:doc.voucher_type=='Reversal Of ITC'")
+		],
+		'Purchase Invoice': [
+			dict(fieldname='eligibility_for_itc', label='Eligibility For ITC',
+				fieldtype='Select', insert_after='reason_for_issuing_document', print_hide=1,
+				options='Input Service Distributor\nImport Of Service\nImport Of Capital Goods\nITC on Reverse Charge\nIneligible As Per Section 17(5)\nIneligible Others\nAll Other ITC',
+				default="All Other ITC")
+		],
+		'Purchase Invoice Item': [
+			dict(fieldname='taxable_value', label='Taxable Value',
+				fieldtype='Currency', insert_after='base_net_amount', hidden=1, options="Company:company:default_currency",
+				print_hide=1)
+		]
+	}
+
+	create_custom_fields(custom_fields, update=True)
+
+	# Patch ITC Availed fields from Data to Currency
+	# Patch Availed ITC for current fiscal_year
+
+	gst_accounts = get_gst_accounts(only_non_reverse_charge=1)
+
+	frappe.db.sql("""
+		UPDATE `tabCustom Field` SET fieldtype='Currency', options='Company:company:default_currency'
+		WHERE dt = 'Purchase Invoice' and fieldname in ('itc_integrated_tax', 'itc_state_tax', 'itc_central_tax',
+			'itc_cess_amount')
+	""")
+
+	frappe.db.sql("""UPDATE `tabPurchase Invoice` set itc_integrated_tax = '0'
+		WHERE trim(coalesce(itc_integrated_tax, '')) = '' """)
+
+	frappe.db.sql("""UPDATE `tabPurchase Invoice` set itc_state_tax = '0'
+		WHERE trim(coalesce(itc_state_tax, '')) = '' """)
+
+	frappe.db.sql("""UPDATE `tabPurchase Invoice` set itc_central_tax = '0'
+		WHERE trim(coalesce(itc_central_tax, '')) = '' """)
+
+	frappe.db.sql("""UPDATE `tabPurchase Invoice` set itc_cess_amount = '0'
+		WHERE trim(coalesce(itc_cess_amount, '')) = '' """)
+
+	# Get purchase invoices
+	invoices = frappe.get_all('Purchase Invoice',
+		{'posting_date': ('>=', '2021-04-01'), 'eligibility_for_itc': ('!=', 'Ineligible')},
+		['name'])
+
+	amount_map = {}
+
+	if invoices:
+		invoice_list = set([d.name for d in invoices])
+
+		# Get GST applied
+		amounts = frappe.db.sql("""
+			SELECT parent, account_head, sum(base_tax_amount_after_discount_amount) as amount
+			FROM `tabPurchase Taxes and Charges`
+			where parent in %s
+			GROUP BY parent, account_head
+		""", (invoice_list), as_dict=1)
+
+		for d in amounts:
+			amount_map.setdefault(d.parent,
+			{
+				'itc_integrated_tax': 0,
+				'itc_state_tax': 0,
+				'itc_central_tax': 0,
+				'itc_cess_amount': 0
+			})
+
+			if d.account_head in gst_accounts.get('igst_account'):
+				amount_map[d.parent]['itc_integrated_tax'] += d.amount
+			if d.account_head in gst_accounts.get('cgst_account'):
+				amount_map[d.parent]['itc_central_tax'] += d.amount
+			if d.account_head in gst_accounts.get('sgst_account'):
+				amount_map[d.parent]['itc_state_tax'] += d.amount
+			if d.account_head in gst_accounts.get('cess_account'):
+				amount_map[d.parent]['itc_cess_amount'] += d.amount
+
+		for invoice, values in amount_map.items():
+			frappe.db.set_value('Purchase Invoice', invoice, {
+				'itc_integrated_tax': values.get('itc_integrated_tax'),
+				'itc_central_tax': values.get('itc_central_tax'),
+				'itc_state_tax': values['itc_state_tax'],
+				'itc_cess_amount': values['itc_cess_amount'],
+			})
\ No newline at end of file
diff --git a/erpnext/regional/doctype/gstr_3b_report/gstr_3b_report.html b/erpnext/regional/doctype/gstr_3b_report/gstr_3b_report.html
index 369a400..3b6a45a 100644
--- a/erpnext/regional/doctype/gstr_3b_report/gstr_3b_report.html
+++ b/erpnext/regional/doctype/gstr_3b_report/gstr_3b_report.html
@@ -172,7 +172,7 @@
 		</thead>
 		<tbody>
 			<tr>
-				<td><b>(A) {{__("ITC Available (whether in full op part)")}}</b></td>
+				<td><b>(A) {{__("ITC Available (whether in full or part)")}}</b></td>
 				<td></td>
 				<td></td>
 				<td></td>
diff --git a/erpnext/regional/doctype/gstr_3b_report/gstr_3b_report.py b/erpnext/regional/doctype/gstr_3b_report/gstr_3b_report.py
index a5dd5a2..3ddcc58 100644
--- a/erpnext/regional/doctype/gstr_3b_report/gstr_3b_report.py
+++ b/erpnext/regional/doctype/gstr_3b_report/gstr_3b_report.py
@@ -3,148 +3,21 @@
 # For license information, please see license.txt
 
 from __future__ import unicode_literals
+import os
+import json
 import frappe
+from six import iteritems
 from frappe import _
 from frappe.model.document import Document
-import json
-from six import iteritems
-from frappe.utils import flt, getdate
+from frappe.utils import flt, cstr
 from erpnext.regional.india import state_numbers
 
 class GSTR3BReport(Document):
-	def before_save(self):
-
+	def validate(self):
 		self.get_data()
 
 	def get_data(self):
-
-		self.report_dict = {
-			"gstin": "",
-			"ret_period": "",
-			"inward_sup": {
-				"isup_details": [
-					{
-						"ty": "GST",
-						"intra": 0,
-						"inter": 0
-					},
-					{
-						"ty": "NONGST",
-						"inter": 0,
-						"intra": 0
-					}
-				]
-			},
-			"sup_details": {
-				"osup_zero": {
-					"csamt": 0,
-					"txval": 0,
-					"iamt": 0
-				},
-				"osup_nil_exmp": {
-					"txval": 0
-				},
-				"osup_det": {
-					"samt": 0,
-					"csamt": 0,
-					"txval": 0,
-					"camt": 0,
-					"iamt": 0
-				},
-				"isup_rev": {
-					"samt": 0,
-					"csamt": 0,
-					"txval": 0,
-					"camt": 0,
-					"iamt": 0
-				},
-				"osup_nongst": {
-					"txval": 0,
-				}
-			},
-			"inter_sup": {
-				"unreg_details": [],
-				"comp_details": [],
-				"uin_details": []
-			},
-			"itc_elg": {
-				"itc_avl": [
-					{
-						"csamt": 0,
-						"samt": 0,
-						"ty": "IMPG",
-						"camt": 0,
-						"iamt": 0
-					},
-					{
-						"csamt": 0,
-						"samt": 0,
-						"ty": "IMPS",
-						"camt": 0,
-						"iamt": 0
-					},
-					{
-						"samt": 0,
-						"csamt": 0,
-						"ty": "ISRC",
-						"camt": 0,
-						"iamt": 0
-					},
-					{
-						"ty": "ISD",
-						"iamt": 0,
-						"camt": 0,
-						"samt": 0,
-						"csamt": 0
-					},
-					{
-						"samt": 0,
-						"csamt": 0,
-						"ty": "OTH",
-						"camt": 0,
-						"iamt": 0
-					}
-				],
-				"itc_rev": [
-					{
-						"ty": "RUL",
-						"iamt": 0,
-						"camt": 0,
-						"samt": 0,
-						"csamt": 0
-					},
-					{
-						"ty": "OTH",
-						"iamt": 0,
-						"camt": 0,
-						"samt": 0,
-						"csamt": 0
-					}
-				],
-				"itc_net": {
-					"samt": 0,
-					"csamt": 0,
-					"camt": 0,
-					"iamt": 0
-				},
-				"itc_inelg": [
-					{
-						"ty": "RUL",
-						"iamt": 0,
-						"camt": 0,
-						"samt": 0,
-						"csamt": 0
-					},
-					{
-						"ty": "OTH",
-						"iamt": 0,
-						"camt": 0,
-						"samt": 0,
-						"csamt": 0
-					}
-				]
-			}
-		}
+		self.report_dict = json.loads(get_json('gstr_3b_report_template'))
 
 		self.gst_details = self.get_company_gst_details()
 		self.report_dict["gstin"] = self.gst_details.get("gstin")
@@ -152,23 +25,19 @@
 		self.month_no = get_period(self.month)
 		self.account_heads = self.get_account_heads()
 
-		outward_supply_tax_amounts = self.get_tax_amounts("Sales Invoice")
-		inward_supply_tax_amounts = self.get_tax_amounts("Purchase Invoice", reverse_charge="Y")
+		self.get_outward_supply_details("Sales Invoice")
+		self.set_outward_taxable_supplies()
+
+		self.get_outward_supply_details("Purchase Invoice", reverse_charge=True)
+		self.set_supplies_liable_to_reverse_charge()
+
 		itc_details = self.get_itc_details()
-
-		self.prepare_data("Sales Invoice", outward_supply_tax_amounts, "sup_details", "osup_det", ["Registered Regular"])
-		self.prepare_data("Sales Invoice", outward_supply_tax_amounts, "sup_details", "osup_zero", ["SEZ", "Deemed Export", "Overseas"])
-		self.prepare_data("Purchase Invoice", inward_supply_tax_amounts, "sup_details", "isup_rev", ["Unregistered", "Overseas"], reverse_charge="Y")
-		self.report_dict["sup_details"]["osup_nil_exmp"]["txval"] = flt(self.get_nil_rated_supply_value(), 2)
 		self.set_itc_details(itc_details)
-
-		inter_state_supplies = self.get_inter_state_supplies(self.gst_details.get("gst_state_number"))
+		self.get_itc_reversal_entries()
 		inward_nil_exempt = self.get_inward_nil_exempt(self.gst_details.get("gst_state"))
-		self.set_inter_state_supply(inter_state_supplies)
 		self.set_inward_nil_exempt(inward_nil_exempt)
 
 		self.missing_field_invoices = self.get_missing_field_invoices()
-
 		self.json_output = frappe.as_json(self.report_dict)
 
 	def set_inward_nil_exempt(self, inward_nil_exempt):
@@ -178,189 +47,95 @@
 		self.report_dict["inward_sup"]["isup_details"][1]["intra"] = flt(inward_nil_exempt.get("non_gst").get("intra"), 2)
 
 	def set_itc_details(self, itc_details):
-
-		itc_type_map = {
+		itc_eligible_type_map = {
 			'IMPG': 'Import Of Capital Goods',
 			'IMPS': 'Import Of Service',
+			'ISRC': 'ITC on Reverse Charge',
 			'ISD': 'Input Service Distributor',
 			'OTH': 'All Other ITC'
 		}
 
+		itc_ineligible_map = {
+			'RUL': 'Ineligible As Per Section 17(5)',
+			'OTH': 'Ineligible Others'
+		}
+
 		net_itc = self.report_dict["itc_elg"]["itc_net"]
 
 		for d in self.report_dict["itc_elg"]["itc_avl"]:
-
-			itc_type = itc_type_map.get(d["ty"])
-
-			if d["ty"] == 'ISRC':
-				reverse_charge = ["Y"]
-				itc_type = 'All Other ITC'
-				gst_category = ['Unregistered', 'Overseas']
-			else:
-				gst_category = ['Unregistered', 'Overseas', 'Registered Regular']
-				reverse_charge = ["N", "Y"]
-
-			for account_head in self.account_heads:
-				for category in gst_category:
-					for charge_type in reverse_charge:
-						for key in [['iamt', 'igst_account'], ['camt', 'cgst_account'], ['samt', 'sgst_account'], ['csamt', 'cess_account']]:
-							d[key[0]] += flt(itc_details.get((category, itc_type, charge_type, account_head.get(key[1])), {}).get("amount"), 2)
-
+			itc_type = itc_eligible_type_map.get(d["ty"])
 			for key in ['iamt', 'camt', 'samt', 'csamt']:
+				d[key] = flt(itc_details.get(itc_type, {}).get(key))
 				net_itc[key] += flt(d[key], 2)
 
-		for account_head in self.account_heads:
-			itc_inelg = self.report_dict["itc_elg"]["itc_inelg"][1]
-			for key in [['iamt', 'igst_account'], ['camt', 'cgst_account'], ['samt', 'sgst_account'], ['csamt', 'cess_account']]:
-				itc_inelg[key[0]] = flt(itc_details.get(("Ineligible", "N", account_head.get(key[1])), {}).get("amount"), 2)
+		for d in self.report_dict["itc_elg"]["itc_inelg"]:
+			itc_type = itc_ineligible_map.get(d["ty"])
+			for key in ['iamt', 'camt', 'samt', 'csamt']:
+				d[key] = flt(itc_details.get(itc_type, {}).get(key))
 
-	def prepare_data(self, doctype, tax_details, supply_type, supply_category, gst_category_list, reverse_charge="N"):
+	def get_itc_reversal_entries(self):
+		reversal_entries = frappe.db.sql("""
+			SELECT ja.account, j.reversal_type, sum(credit_in_account_currency) as amount
+			FROM `tabJournal Entry` j, `tabJournal Entry Account` ja
+			where j.docstatus = 1
+			and j.is_opening = 'No'
+			and ja.parent = j.name
+			and j.voucher_type = 'Reversal Of ITC'
+			and month(j.posting_date) = %s and year(j.posting_date) = %s
+			and j.company = %s and j.company_gstin = %s
+			GROUP BY ja.account, j.reversal_type""", (self.month_no, self.year, self.company,
+			self.gst_details.get("gstin")), as_dict=1)
 
-		account_map = {
-			'sgst_account': 'samt',
-			'cess_account': 'csamt',
-			'cgst_account': 'camt',
-			'igst_account': 'iamt'
-		}
+		net_itc = self.report_dict["itc_elg"]["itc_net"]
 
-		txval = 0
-		total_taxable_value = self.get_total_taxable_value(doctype, reverse_charge)
+		for entry in reversal_entries:
+			if entry.reversal_type == 'As per rules 42 & 43 of CGST Rules':
+				index = 0
+			else:
+				index = 1
 
-		for gst_category in gst_category_list:
-			txval += total_taxable_value.get(gst_category,0)
-			for account_head in self.account_heads:
-				for account_type, account_name in iteritems(account_head):
-					if account_map.get(account_type) in self.report_dict.get(supply_type).get(supply_category):
-						self.report_dict[supply_type][supply_category][account_map.get(account_type)] += \
-							flt(tax_details.get((account_name, gst_category), {}).get("amount"), 2)
-
-		self.report_dict[supply_type][supply_category]["txval"] += flt(txval, 2)
-
-	def set_inter_state_supply(self, inter_state_supply):
-		osup_det = self.report_dict["sup_details"]["osup_det"]
-
-		for key, value in iteritems(inter_state_supply):
-			if key[0] == "Unregistered":
-				self.report_dict["inter_sup"]["unreg_details"].append(value)
-
-			if key[0] == "Registered Composition":
-				self.report_dict["inter_sup"]["comp_details"].append(value)
-
-			if key[0] == "UIN Holders":
-				self.report_dict["inter_sup"]["uin_details"].append(value)
-
-	def get_total_taxable_value(self, doctype, reverse_charge):
-
-		return frappe._dict(frappe.db.sql("""
-			select gst_category, sum(net_total) as total
-			from `tab{doctype}`
-			where docstatus = 1 and month(posting_date) = %s
-			and year(posting_date) = %s and reverse_charge = %s
-			and company = %s and company_gstin = %s
-			group by gst_category
-			""" #nosec
-			.format(doctype = doctype), (self.month_no, self.year, reverse_charge, self.company, self.gst_details.get("gstin"))))
+			for key in ['camt', 'samt', 'iamt', 'csamt']:
+				if entry.account in self.account_heads.get(key):
+					self.report_dict["itc_elg"]["itc_rev"][index][key] += flt(entry.amount)
+					net_itc[key] -= flt(entry.amount)
 
 	def get_itc_details(self):
-		itc_amount = frappe.db.sql("""
-			select s.gst_category, sum(t.base_tax_amount_after_discount_amount) as tax_amount,
-			t.account_head, s.eligibility_for_itc, s.reverse_charge
-			from `tabPurchase Invoice` s , `tabPurchase Taxes and Charges` t
-			where s.docstatus = 1 and t.parent = s.name
-			and month(s.posting_date) = %s and year(s.posting_date) = %s and s.company = %s
-			and s.company_gstin = %s
-			group by t.account_head, s.gst_category, s.eligibility_for_itc
-			""",
-			(self.month_no, self.year, self.company, self.gst_details.get("gstin")), as_dict=1)
+		itc_amounts = frappe.db.sql("""
+			SELECT eligibility_for_itc, sum(itc_integrated_tax) as itc_integrated_tax,
+			sum(itc_central_tax) as itc_central_tax,
+			sum(itc_state_tax) as itc_state_tax,
+			sum(itc_cess_amount) as itc_cess_amount
+			FROM `tabPurchase Invoice`
+			WHERE docstatus = 1
+			and is_opening = 'No'
+			and month(posting_date) = %s and year(posting_date) = %s and company = %s
+			and company_gstin = %s
+			GROUP BY eligibility_for_itc
+		""", (self.month_no, self.year, self.company, self.gst_details.get("gstin")), as_dict=1)
 
 		itc_details = {}
-
-		for d in itc_amount:
-			itc_details.setdefault((d.gst_category, d.eligibility_for_itc, d.reverse_charge, d.account_head),{
-				"amount": d.tax_amount
+		for d in itc_amounts:
+			itc_details.setdefault(d.eligibility_for_itc, {
+				'iamt': d.itc_integrated_tax,
+				'camt': d.itc_central_tax,
+				'samt': d.itc_state_tax,
+				'csamt': d.itc_cess_amount
 			})
 
 		return itc_details
 
-	def get_nil_rated_supply_value(self):
-
-		return frappe.db.sql("""
-			select sum(i.base_amount) as total from
-			`tabSales Invoice Item` i, `tabSales Invoice` s
-			where s.docstatus = 1 and i.parent = s.name and i.is_nil_exempt = 1
-			and month(s.posting_date) = %s and year(s.posting_date) = %s
-			and s.company = %s and s.company_gstin = %s""",
-			(self.month_no, self.year, self.company, self.gst_details.get("gstin")), as_dict=1)[0].total
-
-	def get_inter_state_supplies(self, state_number):
-		inter_state_supply_tax = frappe.db.sql(""" select t.account_head, t.tax_amount_after_discount_amount as tax_amount,
-			s.name, s.net_total, s.place_of_supply, s.gst_category from `tabSales Invoice` s, `tabSales Taxes and Charges` t
-			where t.parent = s.name and s.docstatus = 1 and month(s.posting_date) = %s and year(s.posting_date) = %s
-			and s.company = %s and s.company_gstin = %s and s.gst_category in ('Unregistered', 'Registered Composition', 'UIN Holders')
-		""", (self.month_no, self.year, self.company, self.gst_details.get("gstin")), as_dict=1)
-
-		inter_state_supply_tax_mapping = {}
-		inter_state_supply_details = {}
-
-		for d in inter_state_supply_tax:
-			inter_state_supply_tax_mapping.setdefault(d.name, {
-				'place_of_supply': d.place_of_supply,
-				'taxable_value': d.net_total,
-				'gst_category': d.gst_category,
-				'camt': 0.0,
-				'samt': 0.0,
-				'iamt': 0.0,
-				'csamt': 0.0
-			})
-
-			if d.account_head in [a.cgst_account for a in self.account_heads]:
-				inter_state_supply_tax_mapping[d.name]['camt'] += d.tax_amount
-
-			if d.account_head in [a.sgst_account for a in self.account_heads]:
-				inter_state_supply_tax_mapping[d.name]['samt'] += d.tax_amount
-
-			if d.account_head in [a.igst_account for a in self.account_heads]:
-				inter_state_supply_tax_mapping[d.name]['iamt'] += d.tax_amount
-
-			if d.account_head in [a.cess_account for a in self.account_heads]:
-				inter_state_supply_tax_mapping[d.name]['csamt'] += d.tax_amount
-
-		for key, value in iteritems(inter_state_supply_tax_mapping):
-			if value.get('place_of_supply'):
-				osup_det = self.report_dict["sup_details"]["osup_det"]
-				osup_det["txval"] = flt(osup_det["txval"] + value['taxable_value'], 2)
-				osup_det["iamt"] = flt(osup_det["iamt"] + value['iamt'], 2)
-				osup_det["camt"] = flt(osup_det["camt"] + value['camt'], 2)
-				osup_det["samt"] = flt(osup_det["samt"] + value['samt'], 2)
-				osup_det["csamt"] = flt(osup_det["csamt"] + value['csamt'], 2)
-
-				if state_number != value.get('place_of_supply').split("-")[0]:
-					inter_state_supply_details.setdefault((value.get('gst_category'), value.get('place_of_supply')), {
-						"txval": 0.0,
-						"pos": value.get('place_of_supply').split("-")[0],
-						"iamt": 0.0
-					})
-
-					inter_state_supply_details[(value.get('gst_category'), value.get('place_of_supply'))]['txval'] += value['taxable_value']
-					inter_state_supply_details[(value.get('gst_category'), value.get('place_of_supply'))]['iamt'] += value['iamt']
-
-		return inter_state_supply_details
-
 	def get_inward_nil_exempt(self, state):
-		inward_nil_exempt = frappe.db.sql(""" select p.place_of_supply, sum(i.base_amount) as base_amount,
-			i.is_nil_exempt, i.is_non_gst from `tabPurchase Invoice` p , `tabPurchase Invoice Item` i
-			where p.docstatus = 1 and p.name = i.parent
+		inward_nil_exempt = frappe.db.sql("""
+			SELECT p.place_of_supply, sum(i.base_amount) as base_amount, i.is_nil_exempt, i.is_non_gst
+			FROM `tabPurchase Invoice` p , `tabPurchase Invoice Item` i
+			WHERE p.docstatus = 1 and p.name = i.parent
+			and p.is_opening = 'No'
 			and p.gst_category != 'Registered Composition'
-			and (i.is_nil_exempt = 1 or i.is_non_gst = 1) and
-			month(p.posting_date) = %s and year(p.posting_date) = %s and p.company = %s and p.company_gstin = %s
-			group by p.place_of_supply, i.is_nil_exempt, i.is_non_gst""", (self.month_no, self.year, self.company, self.gst_details.get("gstin")), as_dict=1)
-
-		inward_nil_exempt += frappe.db.sql("""SELECT sum(base_net_total) as base_amount, gst_category, place_of_supply
-			FROM `tabPurchase Invoice`
-			WHERE docstatus = 1 and gst_category = 'Registered Composition'
-			and month(posting_date) = %s and year(posting_date) = %s
-			and company = %s and company_gstin = %s
-			group by place_of_supply""", (self.month_no, self.year, self.company, self.gst_details.get("gstin")), as_dict=1)
+			and (i.is_nil_exempt = 1 or i.is_non_gst = 1 or p.gst_category = 'Registered Composition') and
+			month(p.posting_date) = %s and year(p.posting_date) = %s
+			and p.company = %s and p.company_gstin = %s
+			GROUP BY p.place_of_supply, i.is_nil_exempt, i.is_non_gst""",
+			(self.month_no, self.year, self.company, self.gst_details.get("gstin")), as_dict=1)
 
 		inward_nil_exempt_details = {
 			"gst": {
@@ -388,37 +163,193 @@
 
 		return inward_nil_exempt_details
 
-	def get_tax_amounts(self, doctype, reverse_charge="N"):
+	def get_outward_supply_details(self, doctype, reverse_charge=None):
+		self.get_outward_tax_invoices(doctype, reverse_charge=reverse_charge)
+		self.get_outward_items(doctype)
+		self.get_outward_tax_details(doctype)
 
+	def get_outward_tax_invoices(self, doctype, reverse_charge=None):
+		self.invoices = []
+		self.invoice_detail_map = {}
+		condition = ''
+
+		if reverse_charge:
+			condition += "AND reverse_charge = 'Y'"
+
+		invoice_details = frappe.db.sql("""
+			SELECT
+				name, gst_category, export_type, place_of_supply
+			FROM
+				`tab{doctype}`
+			WHERE
+				docstatus = 1
+				AND month(posting_date) = %s
+				AND year(posting_date) = %s
+				AND company = %s
+				AND company_gstin = %s
+				AND is_opening = 'No'
+				{reverse_charge}
+			ORDER BY name
+		""".format(doctype=doctype, reverse_charge=condition), (self.month_no, self.year,
+			self.company, self.gst_details.get("gstin")), as_dict=1)
+
+		for d in invoice_details:
+			self.invoice_detail_map.setdefault(d.name, d)
+			self.invoices.append(d.name)
+
+	def get_outward_items(self, doctype):
+		self.invoice_items = frappe._dict()
+		self.is_nil_exempt = []
+		self.is_non_gst = []
+
+		if self.get('invoices'):
+			item_details = frappe.db.sql("""
+				SELECT
+					item_code, parent, taxable_value, base_net_amount, item_tax_rate,
+					is_nil_exempt, is_non_gst
+				FROM
+					`tab%s Item`
+				WHERE parent in (%s)
+			""" % (doctype, ', '.join(['%s']*len(self.invoices))), tuple(self.invoices), as_dict=1)
+
+			for d in item_details:
+				if d.item_code not in self.invoice_items.get(d.parent, {}):
+					self.invoice_items.setdefault(d.parent, {}).setdefault(d.item_code,
+						sum((i.get('taxable_value', 0) or i.get('base_net_amount', 0)) for i in item_details
+							if i.item_code == d.item_code and i.parent == d.parent))
+
+				if d.is_nil_exempt and d.item_code not in self.is_nil_exempt:
+					self.is_nil_exempt.append(d.item_code)
+
+				if d.is_non_gst and d.item_code not in self.is_non_gst:
+					self.is_non_gst.append(d.item_code)
+
+	def get_outward_tax_details(self, doctype):
 		if doctype == "Sales Invoice":
 			tax_template = 'Sales Taxes and Charges'
 		elif doctype == "Purchase Invoice":
 			tax_template = 'Purchase Taxes and Charges'
 
-		tax_amounts = frappe.db.sql("""
-			select s.gst_category, sum(t.base_tax_amount_after_discount_amount) as tax_amount, t.account_head
-			from `tab{doctype}` s , `tab{template}` t
-			where s.docstatus = 1 and t.parent = s.name and s.reverse_charge = %s
-			and month(s.posting_date) = %s and year(s.posting_date) = %s and s.company = %s
-			and s.company_gstin = %s
-			group by t.account_head, s.gst_category
-			""" #nosec
-			.format(doctype=doctype, template=tax_template),
-			(reverse_charge, self.month_no, self.year, self.company, self.gst_details.get("gstin")), as_dict=1)
+		self.items_based_on_tax_rate = {}
+		self.invoice_cess = frappe._dict()
+		self.cgst_sgst_invoices = []
 
-		tax_details = {}
+		if self.get('invoices'):
+			tax_details = frappe.db.sql("""
+				SELECT
+					parent, account_head, item_wise_tax_detail, base_tax_amount_after_discount_amount
+				FROM `tab%s`
+				WHERE
+					parenttype = %s and docstatus = 1
+					and parent in (%s)
+				ORDER BY account_head
+			""" % (tax_template, '%s', ', '.join(['%s']*len(self.invoices))),
+				tuple([doctype] + list(self.invoices)))
 
-		for d in tax_amounts:
-			tax_details.setdefault(
-				(d.account_head,d.gst_category),{
-					"amount": d.get("tax_amount"),
-				}
-			)
+			for parent, account, item_wise_tax_detail, tax_amount in tax_details:
+				if account in self.account_heads.get('csamt'):
+					self.invoice_cess.setdefault(parent, tax_amount)
+				else:
+					if item_wise_tax_detail:
+						try:
+							item_wise_tax_detail = json.loads(item_wise_tax_detail)
+							cgst_or_sgst = False
+							if account in self.account_heads.get('camt') \
+								or account in self.account_heads.get('samt'):
+								cgst_or_sgst = True
 
-		return tax_details
+							for item_code, tax_amounts in item_wise_tax_detail.items():
+								if not (cgst_or_sgst or account in self.account_heads.get('iamt') or
+									(item_code in self.is_non_gst + self.is_nil_exempt)):
+									continue
+
+								tax_rate = tax_amounts[0]
+								if tax_rate:
+									if cgst_or_sgst:
+										tax_rate *= 2
+										if parent not in self.cgst_sgst_invoices:
+											self.cgst_sgst_invoices.append(parent)
+
+									rate_based_dict = self.items_based_on_tax_rate\
+										.setdefault(parent, {}).setdefault(tax_rate, [])
+									if item_code not in rate_based_dict:
+										rate_based_dict.append(item_code)
+						except ValueError:
+							continue
+
+
+		if self.get('invoice_items'):
+			# Build itemised tax for export invoices, nil and exempted where tax table is blank
+			for invoice, items in iteritems(self.invoice_items):
+				if invoice not in self.items_based_on_tax_rate and (self.invoice_detail_map.get(invoice, {}).get('export_type')
+					== "Without Payment of Tax"):
+					self.items_based_on_tax_rate.setdefault(invoice, {}).setdefault(0, items.keys())
+
+	def set_outward_taxable_supplies(self):
+		inter_state_supply_details = {}
+
+		for inv, items_based_on_rate in self.items_based_on_tax_rate.items():
+			for rate, items in items_based_on_rate.items():
+				for item_code, taxable_value in self.invoice_items.get(inv).items():
+					if item_code in items:
+						if item_code in self.is_nil_exempt:
+							self.report_dict['sup_details']['osup_nil_exmp']['txval'] += taxable_value
+						elif item_code in self.is_non_gst:
+							self.report_dict['sup_details']['osup_nongst']['txval'] += taxable_value
+						elif rate == 0:
+							self.report_dict['sup_details']['osup_zero']['txval'] += taxable_value
+							#self.report_dict['sup_details']['osup_zero'][key] += tax_amount
+						else:
+							if inv in self.cgst_sgst_invoices:
+								tax_rate = rate/2
+								self.report_dict['sup_details']['osup_det']['camt'] += (taxable_value * tax_rate /100)
+								self.report_dict['sup_details']['osup_det']['samt'] += (taxable_value * tax_rate /100)
+								self.report_dict['sup_details']['osup_det']['txval'] += taxable_value
+							else:
+								self.report_dict['sup_details']['osup_det']['iamt'] += (taxable_value * rate /100)
+								self.report_dict['sup_details']['osup_det']['txval'] += taxable_value
+
+								gst_category = self.invoice_detail_map.get(inv, {}).get('gst_category')
+								place_of_supply = self.invoice_detail_map.get(inv, {}).get('place_of_supply', '00-Other Territory')
+
+								if gst_category in ['Unregistered', 'Registered Composition', 'UIN Holders'] and \
+								self.gst_details.get("gst_state") != place_of_supply.split("-")[1]:
+									inter_state_supply_details.setdefault((gst_category, place_of_supply), {
+										"txval": 0.0,
+										"pos": place_of_supply.split("-")[0],
+										"iamt": 0.0
+									})
+									inter_state_supply_details[(gst_category, place_of_supply)]['txval'] += taxable_value
+									inter_state_supply_details[(gst_category, place_of_supply)]['iamt'] += (taxable_value * rate /100)
+
+		self.set_inter_state_supply(inter_state_supply_details)
+
+	def set_supplies_liable_to_reverse_charge(self):
+		for inv, items_based_on_rate in self.items_based_on_tax_rate.items():
+			for rate, items in items_based_on_rate.items():
+				for item_code, taxable_value in self.invoice_items.get(inv).items():
+					if item_code in items:
+						if inv in self.cgst_sgst_invoices:
+							tax_rate = rate/2
+							self.report_dict['sup_details']['isup_rev']['camt'] += (taxable_value * tax_rate /100)
+							self.report_dict['sup_details']['isup_rev']['samt'] += (taxable_value * tax_rate /100)
+							self.report_dict['sup_details']['isup_rev']['txval'] += taxable_value
+						else:
+							self.report_dict['sup_details']['isup_rev']['iamt'] += (taxable_value * rate /100)
+							self.report_dict['sup_details']['isup_rev']['txval'] += taxable_value
+
+	def set_inter_state_supply(self, inter_state_supply):
+		for key, value in iteritems(inter_state_supply):
+			if key[0] == "Unregistered":
+				self.report_dict["inter_sup"]["unreg_details"].append(value)
+
+			if key[0] == "Registered Composition":
+				self.report_dict["inter_sup"]["comp_details"].append(value)
+
+			if key[0] == "UIN Holders":
+				self.report_dict["inter_sup"]["uin_details"].append(value)
 
 	def get_company_gst_details(self):
-
 		gst_details =  frappe.get_all("Address",
 			fields=["gstin", "gst_state", "gst_state_number"],
 			filters={
@@ -431,20 +362,28 @@
 			frappe.throw(_("Please enter GSTIN and state for the Company Address {0}").format(self.company_address))
 
 	def get_account_heads(self):
+		account_map = {
+			'sgst_account': 'samt',
+			'cess_account': 'csamt',
+			'cgst_account': 'camt',
+			'igst_account': 'iamt'
+		}
 
-		account_heads =  frappe.get_all("GST Account",
-			fields=["cgst_account", "sgst_account", "igst_account", "cess_account"],
-			filters={
-				"company":self.company
-			})
+		account_heads = {}
+		gst_settings_accounts = frappe.get_all("GST Account",
+			filters={'company': self.company, 'is_reverse_charge_account': 0},
+			fields=["cgst_account", "sgst_account", "igst_account", "cess_account"])
 
-		if account_heads:
-			return account_heads
-		else:
-			frappe.throw(_("Please set account heads in GST Settings for Compnay {0}").format(self.company))
+		if not gst_settings_accounts:
+			frappe.throw(_("Please set GST Accounts in GST Settings"))
+
+		for d in gst_settings_accounts:
+			for acc, val in d.items():
+				account_heads.setdefault(account_map.get(acc), []).append(val)
+
+		return account_heads
 
 	def get_missing_field_invoices(self):
-
 		missing_field_invoices = []
 
 		for doctype in ["Sales Invoice", "Purchase Invoice"]:
@@ -456,26 +395,32 @@
 				party_type = 'Supplier'
 				party = 'supplier'
 
-			docnames = frappe.db.sql("""
-				select t1.name from `tab{doctype}` t1, `tab{party_type}` t2
-				where t1.docstatus = 1 and month(t1.posting_date) = %s and year(t1.posting_date) = %s
+			docnames = frappe.db.sql(
+			"""
+				SELECT t1.name FROM `tab{doctype}` t1, `tab{party_type}` t2
+				WHERE t1.docstatus = 1 and t1.is_opening = 'No'
+				and month(t1.posting_date) = %s and year(t1.posting_date) = %s
 				and t1.company = %s and t1.place_of_supply IS NULL and t1.{party} = t2.name and
 				t2.gst_category != 'Overseas'
-			""".format(doctype = doctype, party_type = party_type, party=party), (self.month_no, self.year, self.company), as_dict=1) #nosec
+			""".format(doctype = doctype, party_type = party_type,
+				party=party) ,(self.month_no, self.year, self.company), as_dict=1) #nosec
 
 			for d in docnames:
 				missing_field_invoices.append(d.name)
 
 		return ",".join(missing_field_invoices)
 
-def get_state_code(state):
+def get_json(template):
+	file_path = os.path.join(os.path.dirname(__file__), '{template}.json'.format(template=template))
+	with open(file_path, 'r') as f:
+		return cstr(f.read())
 
+def get_state_code(state):
 	state_code = state_numbers.get(state)
 
 	return state_code
 
 def get_period(month, year=None):
-
 	month_no = {
 		"January": 1,
 		"February": 2,
@@ -499,13 +444,11 @@
 
 @frappe.whitelist()
 def view_report(name):
-
 	json_data = frappe.get_value("GSTR 3B Report", name, 'json_output')
 	return json.loads(json_data)
 
 @frappe.whitelist()
 def make_json(name):
-
 	json_data = frappe.get_value("GSTR 3B Report", name, 'json_output')
 	file_name = "GST3B.json"
 	frappe.local.response.filename = file_name
diff --git a/erpnext/regional/doctype/gstr_3b_report/gstr_3b_report_template.json b/erpnext/regional/doctype/gstr_3b_report/gstr_3b_report_template.json
new file mode 100644
index 0000000..a68bd6a
--- /dev/null
+++ b/erpnext/regional/doctype/gstr_3b_report/gstr_3b_report_template.json
@@ -0,0 +1,127 @@
+{
+	"gstin": "",
+	"ret_period": "",
+	"inward_sup": {
+		"isup_details": [
+			{
+				"ty": "GST",
+				"intra": 0,
+				"inter": 0
+			},
+			{
+				"ty": "NONGST",
+				"inter": 0,
+				"intra": 0
+			}
+		]
+	},
+	"sup_details": {
+		"osup_zero": {
+			"csamt": 0,
+			"txval": 0,
+			"iamt": 0
+		},
+		"osup_nil_exmp": {
+			"txval": 0
+		},
+		"osup_det": {
+			"samt": 0,
+			"csamt": 0,
+			"txval": 0,
+			"camt": 0,
+			"iamt": 0
+		},
+		"isup_rev": {
+			"samt": 0,
+			"csamt": 0,
+			"txval": 0,
+			"camt": 0,
+			"iamt": 0
+		},
+		"osup_nongst": {
+			"txval": 0
+		}
+	},
+	"inter_sup": {
+		"unreg_details": [],
+		"comp_details": [],
+		"uin_details": []
+	},
+	"itc_elg": {
+		"itc_avl": [
+			{
+				"csamt": 0,
+				"samt": 0,
+				"ty": "IMPG",
+				"camt": 0,
+				"iamt": 0
+			},
+			{
+				"csamt": 0,
+				"samt": 0,
+				"ty": "IMPS",
+				"camt": 0,
+				"iamt": 0
+			},
+			{
+				"samt": 0,
+				"csamt": 0,
+				"ty": "ISRC",
+				"camt": 0,
+				"iamt": 0
+			},
+			{
+				"ty": "ISD",
+				"iamt": 0,
+				"camt": 0,
+				"samt": 0,
+				"csamt": 0
+			},
+			{
+				"samt": 0,
+				"csamt": 0,
+				"ty": "OTH",
+				"camt": 0,
+				"iamt": 0
+			}
+		],
+		"itc_rev": [
+			{
+				"ty": "RUL",
+				"iamt": 0,
+				"camt": 0,
+				"samt": 0,
+				"csamt": 0
+			},
+			{
+				"ty": "OTH",
+				"iamt": 0,
+				"camt": 0,
+				"samt": 0,
+				"csamt": 0
+			}
+		],
+		"itc_net": {
+			"samt": 0,
+			"csamt": 0,
+			"camt": 0,
+			"iamt": 0
+		},
+		"itc_inelg": [
+			{
+				"ty": "RUL",
+				"iamt": 0,
+				"camt": 0,
+				"samt": 0,
+				"csamt": 0
+			},
+			{
+				"ty": "OTH",
+				"iamt": 0,
+				"camt": 0,
+				"samt": 0,
+				"csamt": 0
+			}
+		]
+	}
+}
\ No newline at end of file
diff --git a/erpnext/regional/doctype/gstr_3b_report/test_gstr_3b_report.py b/erpnext/regional/doctype/gstr_3b_report/test_gstr_3b_report.py
index ef8af24..3857ce1 100644
--- a/erpnext/regional/doctype/gstr_3b_report/test_gstr_3b_report.py
+++ b/erpnext/regional/doctype/gstr_3b_report/test_gstr_3b_report.py
@@ -60,8 +60,7 @@
 
 		output = json.loads(report.json_output)
 
-		self.assertEqual(output["sup_details"]["osup_det"]["iamt"], 36),
-		self.assertEqual(output["sup_details"]["osup_zero"]["iamt"], 18),
+		self.assertEqual(output["sup_details"]["osup_det"]["iamt"], 54)
 		self.assertEqual(output["inter_sup"]["unreg_details"][0]["iamt"], 18),
 		self.assertEqual(output["sup_details"]["osup_nil_exmp"]["txval"], 100),
 		self.assertEqual(output["inward_sup"]["isup_details"][0]["intra"], 250)
diff --git a/erpnext/regional/india/setup.py b/erpnext/regional/india/setup.py
index b12e152..229e0c0 100644
--- a/erpnext/regional/india/setup.py
+++ b/erpnext/regional/india/setup.py
@@ -114,9 +114,12 @@
 
 def make_property_setters(patch=False):
 	# GST rules do not allow for an invoice no. bigger than 16 characters
+	journal_entry_types = frappe.get_meta("Journal Entry").get_options("voucher_type").split("\n") + ['Reversal Of ITC']
+
 	if not patch:
 		make_property_setter('Sales Invoice', 'naming_series', 'options', 'SINV-.YY.-\nSRET-.YY.-', '')
 		make_property_setter('Purchase Invoice', 'naming_series', 'options', 'PINV-.YY.-\nPRET-.YY.-', '')
+		make_property_setter('Journal Entry', 'voucher_type', 'options', '\n'.join(journal_entry_types), '')
 
 def make_custom_fields(update=True):
 	hsn_sac_field = dict(fieldname='gst_hsn_code', label='HSN/SAC',
@@ -198,15 +201,20 @@
 	purchase_invoice_itc_fields = [
 			dict(fieldname='eligibility_for_itc', label='Eligibility For ITC',
 				fieldtype='Select', insert_after='reason_for_issuing_document', print_hide=1,
-				options='Input Service Distributor\nImport Of Service\nImport Of Capital Goods\nIneligible\nAll Other ITC', default="All Other ITC"),
+				options='Input Service Distributor\nImport Of Service\nImport Of Capital Goods\nITC on Reverse Charge\nIneligible As Per Section 17(5)\nIneligible Others\nAll Other ITC',
+				default="All Other ITC"),
 			dict(fieldname='itc_integrated_tax', label='Availed ITC Integrated Tax',
-				fieldtype='Data', insert_after='eligibility_for_itc', print_hide=1),
+				fieldtype='Currency', insert_after='eligibility_for_itc',
+				options='Company:company:default_currency', print_hide=1),
 			dict(fieldname='itc_central_tax', label='Availed ITC Central Tax',
-				fieldtype='Data', insert_after='itc_integrated_tax', print_hide=1),
+				fieldtype='Currency', insert_after='itc_integrated_tax',
+				options='Company:company:default_currency', print_hide=1),
 			dict(fieldname='itc_state_tax', label='Availed ITC State/UT Tax',
-				fieldtype='Data', insert_after='itc_central_tax', print_hide=1),
+				fieldtype='Currency', insert_after='itc_central_tax',
+				options='Company:company:default_currency', print_hide=1),
 			dict(fieldname='itc_cess_amount', label='Availed ITC Cess',
-				fieldtype='Data', insert_after='itc_state_tax', print_hide=1),
+				fieldtype='Currency', insert_after='itc_state_tax',
+				options='Company:company:default_currency', print_hide=1),
 		]
 
 	sales_invoice_gst_fields = [
@@ -236,6 +244,23 @@
 				depends_on="eval:doc.gst_category=='Overseas' "),
 		]
 
+	journal_entry_fields = [
+		dict(fieldname='reversal_type', label='Reversal Type',
+			fieldtype='Select', insert_after='voucher_type', print_hide=1,
+			options="As per rules 42 & 43 of CGST Rules\nOthers",
+			depends_on="eval:doc.voucher_type=='Reversal Of ITC'",
+			mandatory_depends_on="eval:doc.voucher_type=='Reversal Of ITC'"),
+		dict(fieldname='company_address', label='Company Address',
+			fieldtype='Link', options='Address', insert_after='reversal_type',
+			print_hide=1, depends_on="eval:doc.voucher_type=='Reversal Of ITC'",
+			mandatory_depends_on="eval:doc.voucher_type=='Reversal Of ITC'"),
+		dict(fieldname='company_gstin', label='Company GSTIN',
+			fieldtype='Data', read_only=1, insert_after='company_address', print_hide=1,
+			fetch_from='company_address.gstin',
+			depends_on="eval:doc.voucher_type=='Reversal Of ITC'",
+			mandatory_depends_on="eval:doc.voucher_type=='Reversal Of ITC'")
+	]
+
 	inter_state_gst_field = [
 		dict(fieldname='is_inter_state', label='Is Inter State',
 			fieldtype='Check', insert_after='disabled', print_hide=1),
@@ -430,13 +455,13 @@
 
 		dict(fieldname='einvoice_section', label='E-Invoice Fields', fieldtype='Section Break', insert_after='gst_vehicle_type',
 			print_hide=1, hidden=1),
-		
+
 		dict(fieldname='ack_no', label='Ack. No.', fieldtype='Data', read_only=1, hidden=1, insert_after='einvoice_section',
 			no_copy=1, print_hide=1),
-		
+
 		dict(fieldname='ack_date', label='Ack. Date', fieldtype='Data', read_only=1, hidden=1, insert_after='ack_no', no_copy=1, print_hide=1),
 
-		dict(fieldname='irn_cancel_date', label='Cancel Date', fieldtype='Data', read_only=1, hidden=1, insert_after='ack_date', 
+		dict(fieldname='irn_cancel_date', label='Cancel Date', fieldtype='Data', read_only=1, hidden=1, insert_after='ack_date',
 			no_copy=1, print_hide=1),
 
 		dict(fieldname='signed_einvoice', label='Signed E-Invoice', fieldtype='Code', options='JSON', hidden=1, insert_after='irn_cancel_date',
@@ -469,6 +494,7 @@
 		'Purchase Receipt': purchase_invoice_gst_fields,
 		'Sales Invoice': sales_invoice_gst_category + invoice_gst_fields + sales_invoice_shipping_fields + sales_invoice_gst_fields + si_ewaybill_fields + si_einvoice_fields,
 		'Delivery Note': sales_invoice_gst_fields + ewaybill_fields + sales_invoice_shipping_fields + delivery_note_gst_category,
+		'Journal Entry': journal_entry_fields,
 		'Sales Order': sales_invoice_gst_fields,
 		'Tax Category': inter_state_gst_field,
 		'Item': [
@@ -486,7 +512,7 @@
 		'Sales Invoice Item': [hsn_sac_field, nil_rated_exempt, is_non_gst, taxable_value],
 		'Purchase Order Item': [hsn_sac_field, nil_rated_exempt, is_non_gst],
 		'Purchase Receipt Item': [hsn_sac_field, nil_rated_exempt, is_non_gst],
-		'Purchase Invoice Item': [hsn_sac_field, nil_rated_exempt, is_non_gst],
+		'Purchase Invoice Item': [hsn_sac_field, nil_rated_exempt, is_non_gst, taxable_value],
 		'Material Request Item': [hsn_sac_field, nil_rated_exempt, is_non_gst],
 		'Salary Component': [
 			dict(fieldname=  'component_type',
diff --git a/erpnext/regional/india/utils.py b/erpnext/regional/india/utils.py
index 052d7bd..ca679e4 100644
--- a/erpnext/regional/india/utils.py
+++ b/erpnext/regional/india/utils.py
@@ -204,8 +204,6 @@
 
 	if doctype in ("Sales Invoice", "Delivery Note", "Sales Order"):
 		master_doctype = "Sales Taxes and Charges Template"
-
-		get_tax_template_for_sez(party_details, master_doctype, company, 'Customer')
 		get_tax_template_based_on_category(master_doctype, company, party_details)
 
 		if party_details.get('taxes_and_charges'):
@@ -216,7 +214,6 @@
 
 	elif doctype in ("Purchase Invoice", "Purchase Order", "Purchase Receipt"):
 		master_doctype = "Purchase Taxes and Charges Template"
-		get_tax_template_for_sez(party_details, master_doctype, company, 'Supplier')
 		get_tax_template_based_on_category(master_doctype, company, party_details)
 
 		if party_details.get('taxes_and_charges'):
@@ -283,20 +280,6 @@
 				{'company': company, 'disabled': 0, 'tax_category': tax_category.name}, 'name')
 	return default_tax
 
-def get_tax_template_for_sez(party_details, master_doctype, company, party_type):
-
-	gst_details = frappe.db.get_value(party_type, {'name': party_details.get(frappe.scrub(party_type))},
-			['gst_category', 'export_type'], as_dict=1)
-
-	if gst_details:
-		if gst_details.gst_category == 'SEZ' and gst_details.export_type == 'With Payment of Tax':
-			default_tax = frappe.db.get_value(master_doctype, {"company": company, "is_inter_state":1, "disabled":0,
-				"gst_state": number_state_mapping[party_details.company_gstin[:2]]})
-
-			party_details["taxes_and_charges"] = default_tax
-			party_details.taxes = get_taxes_and_charges(master_doctype, default_tax)
-
-
 def calculate_annual_eligible_hra_exemption(doc):
 	basic_component, hra_component = frappe.db.get_value('Company',  doc.company,  ["basic_component", "hra_component"])
 	if not (basic_component and hra_component):
@@ -697,10 +680,19 @@
 		return int(state_code)
 
 @frappe.whitelist()
-def get_gst_accounts(company, account_wise=False):
+def get_gst_accounts(company=None, account_wise=False, only_reverse_charge=0, only_non_reverse_charge=0):
+	filters={"parent": "GST Settings"}
+
+	if company:
+		filters.update({'company': company})
+	if only_reverse_charge:
+		filters.update({'is_reverse_charge_account': 1})
+	elif only_non_reverse_charge:
+		filters.update({'is_reverse_charge_account': 0})
+
 	gst_accounts = frappe._dict()
 	gst_settings_accounts = frappe.get_all("GST Account",
-		filters={"parent": "GST Settings", "company": company},
+		filters=filters,
 		fields=["cgst_account", "sgst_account", "igst_account", "cess_account"])
 
 	if not gst_settings_accounts and not frappe.flags.in_test:
@@ -715,101 +707,63 @@
 
 	return gst_accounts
 
-def update_grand_total_for_rcm(doc, method):
+def validate_reverse_charge_transaction(doc, method):
 	country = frappe.get_cached_value('Company', doc.company, 'country')
 
 	if country != 'India':
 		return
 
-	gst_tax, base_gst_tax = get_gst_tax_amount(doc)
-
-	if not base_gst_tax:
-		return
+	base_gst_tax = 0
+	base_reverse_charge_booked = 0
 
 	if doc.reverse_charge == 'Y':
-		doc.taxes_and_charges_added -= gst_tax
-		doc.total_taxes_and_charges -= gst_tax
-		doc.base_taxes_and_charges_added -= base_gst_tax
-		doc.base_total_taxes_and_charges -= base_gst_tax
+		gst_accounts = get_gst_accounts(doc.company, only_reverse_charge=1)
+		reverse_charge_accounts = gst_accounts.get('cgst_account') + gst_accounts.get('sgst_account') \
+			+ gst_accounts.get('igst_account')
 
-		update_totals(gst_tax, base_gst_tax, doc)
-
-def update_totals(gst_tax, base_gst_tax, doc):
-	doc.base_grand_total -= base_gst_tax
-	doc.grand_total -= gst_tax
-
-	if doc.meta.get_field("rounded_total"):
-		if doc.is_rounded_total_disabled():
-			doc.outstanding_amount = doc.grand_total
-		else:
-			doc.rounded_total = round_based_on_smallest_currency_fraction(doc.grand_total,
-				doc.currency, doc.precision("rounded_total"))
-
-			doc.rounding_adjustment += flt(doc.rounded_total - doc.grand_total,
-				doc.precision("rounding_adjustment"))
-
-			doc.outstanding_amount = doc.rounded_total or doc.grand_total
-
-	doc.in_words = money_in_words(doc.grand_total, doc.currency)
-	doc.base_in_words = money_in_words(doc.base_grand_total, erpnext.get_company_currency(doc.company))
-	doc.set_payment_schedule()
-
-def make_regional_gl_entries(gl_entries, doc):
-	country = frappe.get_cached_value('Company', doc.company, 'country')
-
-	if country != 'India':
-		return gl_entries
-
-	gst_tax, base_gst_tax = get_gst_tax_amount(doc)
-
-	if not base_gst_tax:
-		return gl_entries
-
-	if doc.reverse_charge == 'Y':
-		gst_accounts = get_gst_accounts(doc.company)
-		gst_account_list = gst_accounts.get('cgst_account') + gst_accounts.get('sgst_account') \
+		gst_accounts = get_gst_accounts(doc.company, only_non_reverse_charge=1)
+		non_reverse_charge_accounts = gst_accounts.get('cgst_account') + gst_accounts.get('sgst_account') \
 			+ gst_accounts.get('igst_account')
 
 		for tax in doc.get('taxes'):
-			if tax.category not in ("Total", "Valuation and Total"):
-				continue
+			if tax.account_head in non_reverse_charge_accounts:
+				if tax.add_deduct_tax == 'Add':
+					base_gst_tax += tax.base_tax_amount_after_discount_amount
+				else:
+					base_gst_tax += tax.base_tax_amount_after_discount_amount
+			elif tax.account_head in reverse_charge_accounts:
+				if tax.add_deduct_tax == 'Add':
+					base_reverse_charge_booked += tax.base_tax_amount_after_discount_amount
+				else:
+					base_reverse_charge_booked += tax.base_tax_amount_after_discount_amount
 
-			dr_or_cr = "credit" if tax.add_deduct_tax == "Add" else "debit"
-			if flt(tax.base_tax_amount_after_discount_amount) and tax.account_head in gst_account_list:
-				account_currency = get_account_currency(tax.account_head)
+		if base_gst_tax != base_reverse_charge_booked:
+			msg = _("Booked reverse charge is not equal to applied tax amount")
+			msg += "<br>"
+			msg += _("Please refer {gst_document_link} to learn more about how to setup and create reverse charge invoice").format(
+				gst_document_link='<a href="https://docs.erpnext.com/docs/user/manual/en/regional/india/gst-setup">GST Documentation</a>')
 
-				gl_entries.append(doc.get_gl_dict(
-					{
-						"account": tax.account_head,
-						"cost_center": tax.cost_center,
-						"posting_date": doc.posting_date,
-						"against": doc.supplier,
-						dr_or_cr: tax.base_tax_amount_after_discount_amount,
-						dr_or_cr + "_in_account_currency": tax.base_tax_amount_after_discount_amount \
-							if account_currency==doc.company_currency \
-							else tax.tax_amount_after_discount_amount
-					}, account_currency, item=tax)
-				)
+			frappe.throw(msg)
 
-	return gl_entries
+def update_itc_availed_fields(doc, method):
+	country = frappe.get_cached_value('Company', doc.company, 'country')
 
-def get_gst_tax_amount(doc):
-	gst_accounts = get_gst_accounts(doc.company)
-	gst_account_list = gst_accounts.get('cgst_account', []) + gst_accounts.get('sgst_account', []) \
-		+ gst_accounts.get('igst_account', [])
+	if country != 'India':
+		return
 
-	base_gst_tax = 0
-	gst_tax = 0
+	# Initialize values
+	doc.itc_integrated_tax = doc.itc_state_tax = doc.itc_central_tax = doc.itc_cess_amount = 0
+	gst_accounts = get_gst_accounts(doc.company, only_non_reverse_charge=1)
 
 	for tax in doc.get('taxes'):
-		if tax.category not in ("Total", "Valuation and Total"):
-			continue
-
-		if flt(tax.base_tax_amount_after_discount_amount) and tax.account_head in gst_account_list:
-			base_gst_tax += tax.base_tax_amount_after_discount_amount
-			gst_tax += tax.tax_amount_after_discount_amount
-
-	return gst_tax, base_gst_tax
+		if tax.account_head in gst_accounts.get('igst_account', []):
+			doc.itc_integrated_tax += flt(tax.base_tax_amount_after_discount_amount)
+		if tax.account_head in gst_accounts.get('sgst_account', []):
+			doc.itc_state_tax += flt(tax.base_tax_amount_after_discount_amount)
+		if tax.account_head in gst_accounts.get('cgst_account', []):
+			doc.itc_central_tax += flt(tax.base_tax_amount_after_discount_amount)
+		if tax.account_head in gst_accounts.get('cess_account', []):
+			doc.itc_cess_amount += flt(tax.base_tax_amount_after_discount_amount)
 
 @frappe.whitelist()
 def get_regional_round_off_accounts(company, account_list):
diff --git a/erpnext/regional/report/gstr_1/gstr_1.js b/erpnext/regional/report/gstr_1/gstr_1.js
index 1a7ff2b..444f5db 100644
--- a/erpnext/regional/report/gstr_1/gstr_1.js
+++ b/erpnext/regional/report/gstr_1/gstr_1.js
@@ -46,7 +46,13 @@
 			"label": __("Type of Business"),
 			"fieldtype": "Select",
 			"reqd": 1,
-			"options": ["B2B", "B2C Large", "B2C Small", "CDNR", "EXPORT"],
+			"options": [
+				{ "value": "B2B", "label": __("B2B Invoices - 4A, 4B, 4C, 6B, 6C") },
+				{ "value": "B2C Large", "label": __("B2C(Large) Invoices - 5A, 5B") },
+				{ "value": "B2C Small", "label": __("B2C(Small) Invoices - 7") },
+				{ "value": "CDNR-REG", "label": __("Credit/Debit Notes (Registered) - 9B") },
+				{ "value": "EXPORT", "label": __("Export Invoice - 6A") }
+			],
 			"default": "B2B"
 		}
 	],
diff --git a/erpnext/regional/report/gstr_1/gstr_1.py b/erpnext/regional/report/gstr_1/gstr_1.py
index 808fd3a..1e28a40 100644
--- a/erpnext/regional/report/gstr_1/gstr_1.py
+++ b/erpnext/regional/report/gstr_1/gstr_1.py
@@ -32,6 +32,7 @@
 			reverse_charge,
 			return_against,
 			is_return,
+			is_debit_note,
 			gst_category,
 			export_type,
 			port_code,
@@ -42,7 +43,7 @@
 
 	def run(self):
 		self.get_columns()
-		self.gst_accounts = get_gst_accounts(self.filters.company)
+		self.gst_accounts = get_gst_accounts(self.filters.company, only_non_reverse_charge=1)
 		self.get_invoice_data()
 
 		if self.invoices:
@@ -62,9 +63,9 @@
 				for rate, items in items_based_on_rate.items():
 					row, taxable_value = self.get_row_data_for_invoice(inv, invoice_details, rate, items)
 
-					if self.filters.get("type_of_business") ==  "CDNR":
+					if self.filters.get("type_of_business") == "CDNR-REG":
 						row.append("Y" if invoice_details.posting_date <= date(2017, 7, 1) else "N")
-						row.append("C" if invoice_details.return_against else "R")
+						row.append("C" if invoice_details.is_return else "D")
 
 					if taxable_value:
 						self.data.append(row)
@@ -105,7 +106,7 @@
 	def get_row_data_for_invoice(self, invoice, invoice_details, tax_rate, items):
 		row = []
 		for fieldname in self.invoice_fields:
-			if self.filters.get("type_of_business") ==  "CDNR" and fieldname == "invoice_value":
+			if self.filters.get("type_of_business") == "CDNR-REG" and fieldname == "invoice_value":
 				row.append(abs(invoice_details.base_rounded_total) or abs(invoice_details.base_grand_total))
 			elif fieldname == "invoice_value":
 				row.append(invoice_details.base_rounded_total or invoice_details.base_grand_total)
@@ -171,7 +172,7 @@
 
 
 		if self.filters.get("type_of_business") ==  "B2B":
-			conditions += "and ifnull(gst_category, '') in ('Registered Regular', 'Deemed Export', 'SEZ') and is_return != 1"
+			conditions += "AND IFNULL(gst_category, '') in ('Registered Regular', 'Deemed Export', 'SEZ') AND is_return != 1"
 
 		if self.filters.get("type_of_business") in ("B2C Large", "B2C Small"):
 			b2c_limit = frappe.db.get_single_value('GST Settings', 'b2c_limit')
@@ -179,19 +180,19 @@
 				frappe.throw(_("Please set B2C Limit in GST Settings."))
 
 		if self.filters.get("type_of_business") ==  "B2C Large":
-			conditions += """ and ifnull(SUBSTR(place_of_supply, 1, 2),'') != ifnull(SUBSTR(company_gstin, 1, 2),'')
-				and grand_total > {0} and is_return != 1 and gst_category ='Unregistered' """.format(flt(b2c_limit))
+			conditions += """ AND ifnull(SUBSTR(place_of_supply, 1, 2),'') != ifnull(SUBSTR(company_gstin, 1, 2),'')
+				AND grand_total > {0} AND is_return != 1 and gst_category ='Unregistered' """.format(flt(b2c_limit))
 
 		elif self.filters.get("type_of_business") ==  "B2C Small":
-			conditions += """ and (
+			conditions += """ AND (
 				SUBSTR(place_of_supply, 1, 2) = SUBSTR(company_gstin, 1, 2)
-					or grand_total <= {0}) and is_return != 1 and gst_category ='Unregistered' """.format(flt(b2c_limit))
+					OR grand_total <= {0}) and is_return != 1 AND gst_category ='Unregistered' """.format(flt(b2c_limit))
 
-		elif self.filters.get("type_of_business") ==  "CDNR":
-			conditions += """ and is_return = 1 """
+		elif self.filters.get("type_of_business") == "CDNR-REG":
+			conditions += """ AND (is_return = 1 OR is_debit_note = 1) AND IFNULL(gst_category, '') in ('Registered Regular', 'Deemed Export', 'SEZ')"""
 
 		elif self.filters.get("type_of_business") ==  "EXPORT":
-			conditions += """ and is_return !=1 and gst_category = 'Overseas' """
+			conditions += """ AND is_return !=1 and gst_category = 'Overseas' """
 		return conditions
 
 	def get_invoice_items(self):
@@ -403,7 +404,7 @@
 						"width": 100
 					}
 				]
-		elif self.filters.get("type_of_business") ==  "CDNR":
+		elif self.filters.get("type_of_business") == "CDNR-REG":
 			self.invoice_columns = [
 				{
 					"fieldname": "customer_gstin",
@@ -438,6 +439,17 @@
 					"width":120
 				},
 				{
+					"fieldname": "reverse_charge",
+					"label": "Reverse Charge",
+					"fieldtype": "Data"
+				},
+				{
+					"fieldname": "export_type",
+					"label": "Export Type",
+					"fieldtype": "Data",
+					"hidden": 1
+				},
+				{
 					"fieldname": "reason_for_issuing_document",
 					"label": "Reason For Issuing document",
 					"fieldtype": "Data",
@@ -450,6 +462,11 @@
 					"width": 120
 				},
 				{
+					"fieldname": "gst_category",
+					"label": "GST Category",
+					"fieldtype": "Data"
+				},
+				{
 					"fieldname": "invoice_value",
 					"label": "Invoice Value",
 					"fieldtype": "Currency",
@@ -458,10 +475,10 @@
 			]
 			self.other_columns = [
 				{
-						"fieldname": "cess_amount",
-						"label": "Cess Amount",
-						"fieldtype": "Currency",
-						"width": 100
+					"fieldname": "cess_amount",
+					"label": "Cess Amount",
+					"fieldtype": "Currency",
+					"width": 100
 				},
 				{
 					"fieldname": "pre_gst",
@@ -589,6 +606,12 @@
 
 		out = get_export_json(res)
 		gst_json["exp"] = out
+	elif filters["type_of_business"] == 'CDNR-REG':
+		for item in report_data[:-1]:
+			res.setdefault(item["customer_gstin"], {}).setdefault(item["invoice_number"],[]).append(item)
+
+		out = get_cdnr_reg_json(res, gstin)
+		gst_json["cdnr"] = out
 
 	return {
 		'report_name': report_name,
@@ -628,7 +651,6 @@
 	return out
 
 def get_b2cs_json(data, gstin):
-
 	company_state_number = gstin[0:2]
 
 	out = []
@@ -713,6 +735,54 @@
 
 	return out
 
+def get_cdnr_reg_json(res, gstin):
+	out = []
+
+	for gst_in in res:
+		cdnr_item, inv = {"ctin": gst_in, "nt": []}, []
+		if not gst_in: continue
+
+		for number, invoice in iteritems(res[gst_in]):
+			if not invoice[0]["place_of_supply"]:
+				frappe.throw(_("""{0} not entered in Invoice {1}.
+					Please update and try again""").format(frappe.bold("Place Of Supply"),
+					frappe.bold(invoice[0]['invoice_number'])))
+
+			inv_item = {
+				"nt_num": invoice[0]["invoice_number"],
+				"nt_dt": getdate(invoice[0]["posting_date"]).strftime('%d-%m-%Y'),
+				"val": abs(flt(invoice[0]["invoice_value"])),
+				"ntty": invoice[0]["document_type"],
+				"pos": "%02d" % int(invoice[0]["place_of_supply"].split('-')[0]),
+				"rchrg": invoice[0]["reverse_charge"],
+				"inv_type": get_invoice_type_for_cdnr(invoice[0])
+			}
+
+			inv_item["itms"] = []
+			for item in invoice:
+				inv_item["itms"].append(get_rate_and_tax_details(item, gstin))
+
+			inv.append(inv_item)
+
+		if not inv: continue
+		cdnr_item["nt"] = inv
+		out.append(cdnr_item)
+
+	return out
+
+def get_invoice_type_for_cdnr(row):
+	if row.get('gst_category') == 'SEZ':
+		if row.get('export_type') == 'WPAY':
+			invoice_type = 'SEWP'
+		else:
+			invoice_type = 'SEWOP'
+	elif row.get('gst_category') == 'Deemed Export':
+		row.invoice_type = 'DE'
+	elif row.get('gst_category') == 'Registered Regular':
+		invoice_type = 'R'
+
+	return invoice_type
+
 def get_basic_invoice_detail(row):
 	return {
 		"inum": row["invoice_number"],