fix(Purchase Order): fetch payment terms (#17121)

* fix: fetch payment terms

* fix: test fixes

* fix: test cases

* fix: test case

* fix: check for payment terms fetching

* fix: test cases

* refactor: fetch payment terms in account settings

* fix: add fetch terms to account settings
diff --git a/erpnext/accounts/doctype/accounts_settings/accounts_settings.json b/erpnext/accounts/doctype/accounts_settings/accounts_settings.json
index be5407b..64a5951 100644
--- a/erpnext/accounts/doctype/accounts_settings/accounts_settings.json
+++ b/erpnext/accounts/doctype/accounts_settings/accounts_settings.json
@@ -1,837 +1,203 @@
 {
- "allow_copy": 0, 
- "allow_events_in_timeline": 0, 
- "allow_guest_to_view": 0, 
- "allow_import": 0, 
- "allow_rename": 0, 
- "beta": 0, 
- "creation": "2013-06-24 15:49:57", 
- "custom": 0, 
- "description": "Settings for Accounts", 
- "docstatus": 0, 
- "doctype": "DocType", 
- "document_type": "Other", 
- "editable_grid": 1, 
- "engine": "InnoDB", 
+ "creation": "2013-06-24 15:49:57",
+ "description": "Settings for Accounts",
+ "doctype": "DocType",
+ "document_type": "Other",
+ "editable_grid": 1,
+ "engine": "InnoDB",
+ "field_order": [
+  "auto_accounting_for_stock",
+  "acc_frozen_upto",
+  "frozen_accounts_modifier",
+  "determine_address_tax_category_from",
+  "column_break_4",
+  "credit_controller",
+  "check_supplier_invoice_uniqueness",
+  "make_payment_via_journal_entry",
+  "unlink_payment_on_cancellation_of_invoice",
+  "unlink_advance_payment_on_cancelation_of_order",
+  "book_asset_depreciation_entry_automatically",
+  "allow_cost_center_in_entry_of_bs_account",
+  "add_taxes_from_item_tax_template",
+  "automatically_fetch_payment_terms",
+  "print_settings",
+  "show_inclusive_tax_in_print",
+  "column_break_12",
+  "show_payment_schedule_in_print",
+  "currency_exchange_section",
+  "allow_stale",
+  "stale_days",
+  "report_settings_sb",
+  "use_custom_cash_flow"
+ ],
  "fields": [
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-  }, 
+   "default": "1",
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+   "fieldtype": "Check",
+   "hidden": 1,
+   "in_list_view": 1,
+   "label": "Make Accounting Entry For Every Stock Movement"
+  },
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-  }, 
+   "description": "Accounting entry frozen up to this date, nobody can do / modify entry except role specified below.",
+   "fieldname": "acc_frozen_upto",
+   "fieldtype": "Date",
+   "in_list_view": 1,
+   "label": "Accounts Frozen Upto"
+  },
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-  }, 
+   "description": "Users with this role are allowed to set frozen accounts and create / modify accounting entries against frozen accounts",
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+   "fieldtype": "Link",
+   "in_list_view": 1,
+   "label": "Role Allowed to Set Frozen Accounts & Edit Frozen Entries",
+   "options": "Role"
+  },
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+   "fieldname": "determine_address_tax_category_from",
+   "fieldtype": "Select",
+   "label": "Determine Address Tax Category From",
+   "options": "Billing Address\nShipping Address"
+  },
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-  }, 
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+   "fieldtype": "Column Break"
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-   "bold": 0, 
-   "collapsible": 0, 
-   "columns": 0, 
-   "description": "Role that is allowed to submit transactions that exceed credit limits set.", 
-   "fetch_if_empty": 0, 
-   "fieldname": "credit_controller", 
-   "fieldtype": "Link", 
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-  }, 
+   "description": "Role that is allowed to submit transactions that exceed credit limits set.",
+   "fieldname": "credit_controller",
+   "fieldtype": "Link",
+   "in_list_view": 1,
+   "label": "Credit Controller",
+   "options": "Role"
+  },
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-  }, 
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+   "fieldtype": "Check",
+   "label": "Check Supplier Invoice Number Uniqueness"
+  },
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-  }, 
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+   "fieldtype": "Check",
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+  },
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+   "fieldname": "unlink_payment_on_cancellation_of_invoice",
+   "fieldtype": "Check",
+   "label": "Unlink Payment on Cancellation of Invoice"
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-   "allow_on_submit": 0, 
-   "bold": 0, 
-   "collapsible": 0, 
-   "columns": 0, 
-   "fetch_if_empty": 0, 
-   "fieldname": "show_payment_schedule_in_print", 
-   "fieldtype": "Check", 
-   "hidden": 0, 
-   "ignore_user_permissions": 0, 
-   "ignore_xss_filter": 0, 
-   "in_filter": 0, 
-   "in_global_search": 0, 
-   "in_list_view": 0, 
-   "in_standard_filter": 0, 
-   "label": "Show Payment Schedule in Print", 
-   "length": 0, 
-   "no_copy": 0, 
-   "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, 
-   "translatable": 0, 
-   "unique": 0
-  }, 
+   "fieldname": "show_payment_schedule_in_print",
+   "fieldtype": "Check",
+   "label": "Show Payment Schedule in Print"
+  },
   {
-   "allow_bulk_edit": 0, 
-   "allow_in_quick_entry": 0, 
-   "allow_on_submit": 0, 
-   "bold": 0, 
-   "collapsible": 0, 
-   "columns": 0, 
-   "fetch_if_empty": 0, 
-   "fieldname": "currency_exchange_section", 
-   "fieldtype": "Section Break", 
-   "hidden": 0, 
-   "ignore_user_permissions": 0, 
-   "ignore_xss_filter": 0, 
-   "in_filter": 0, 
-   "in_global_search": 0, 
-   "in_list_view": 0, 
-   "in_standard_filter": 0, 
-   "label": "Currency Exchange Settings", 
-   "length": 0, 
-   "no_copy": 0, 
-   "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, 
-   "translatable": 0, 
-   "unique": 0
-  }, 
+   "fieldname": "currency_exchange_section",
+   "fieldtype": "Section Break",
+   "label": "Currency Exchange Settings"
+  },
   {
-   "allow_bulk_edit": 0, 
-   "allow_in_quick_entry": 0, 
-   "allow_on_submit": 0, 
-   "bold": 0, 
-   "collapsible": 0, 
-   "columns": 0, 
-   "default": "1", 
-   "fetch_if_empty": 0, 
-   "fieldname": "allow_stale", 
-   "fieldtype": "Check", 
-   "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": "Allow Stale Exchange Rates", 
-   "length": 0, 
-   "no_copy": 0, 
-   "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, 
-   "translatable": 0, 
-   "unique": 0
-  }, 
+   "default": "1",
+   "fieldname": "allow_stale",
+   "fieldtype": "Check",
+   "in_list_view": 1,
+   "label": "Allow Stale Exchange Rates"
+  },
   {
-   "allow_bulk_edit": 0, 
-   "allow_in_quick_entry": 0, 
-   "allow_on_submit": 0, 
-   "bold": 0, 
-   "collapsible": 0, 
-   "columns": 0, 
-   "default": "1", 
-   "depends_on": "eval:doc.allow_stale==0", 
-   "fetch_if_empty": 0, 
-   "fieldname": "stale_days", 
-   "fieldtype": "Int", 
-   "hidden": 0, 
-   "ignore_user_permissions": 0, 
-   "ignore_xss_filter": 0, 
-   "in_filter": 0, 
-   "in_global_search": 0, 
-   "in_list_view": 0, 
-   "in_standard_filter": 0, 
-   "label": "Stale Days", 
-   "length": 0, 
-   "no_copy": 0, 
-   "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, 
-   "translatable": 0, 
-   "unique": 0
-  }, 
+   "default": "1",
+   "depends_on": "eval:doc.allow_stale==0",
+   "fieldname": "stale_days",
+   "fieldtype": "Int",
+   "label": "Stale Days"
+  },
   {
-   "allow_bulk_edit": 0, 
-   "allow_in_quick_entry": 0, 
-   "allow_on_submit": 0, 
-   "bold": 0, 
-   "collapsible": 0, 
-   "columns": 0, 
-   "fetch_if_empty": 0, 
-   "fieldname": "report_settings_sb", 
-   "fieldtype": "Section Break", 
-   "hidden": 0, 
-   "ignore_user_permissions": 0, 
-   "ignore_xss_filter": 0, 
-   "in_filter": 0, 
-   "in_global_search": 0, 
-   "in_list_view": 0, 
-   "in_standard_filter": 0, 
-   "label": "Report Settings", 
-   "length": 0, 
-   "no_copy": 0, 
-   "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, 
-   "translatable": 0, 
-   "unique": 0
-  }, 
+   "fieldname": "report_settings_sb",
+   "fieldtype": "Section Break",
+   "label": "Report Settings"
+  },
   {
-   "allow_bulk_edit": 0, 
-   "allow_in_quick_entry": 0, 
-   "allow_on_submit": 0, 
-   "bold": 0, 
-   "collapsible": 0, 
-   "columns": 0, 
-   "default": "0", 
-   "description": "Only select if you have setup Cash Flow Mapper documents", 
-   "fetch_if_empty": 0, 
-   "fieldname": "use_custom_cash_flow", 
-   "fieldtype": "Check", 
-   "hidden": 0, 
-   "ignore_user_permissions": 0, 
-   "ignore_xss_filter": 0, 
-   "in_filter": 0, 
-   "in_global_search": 0, 
-   "in_list_view": 0, 
-   "in_standard_filter": 0, 
-   "label": "Use Custom Cash Flow Format", 
-   "length": 0, 
-   "no_copy": 0, 
-   "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, 
-   "translatable": 0, 
-   "unique": 0
+   "default": "0",
+   "description": "Only select if you have setup Cash Flow Mapper documents",
+   "fieldname": "use_custom_cash_flow",
+   "fieldtype": "Check",
+   "label": "Use Custom Cash Flow Format"
+  },
+  {
+   "fieldname": "automatically_fetch_payment_terms",
+   "fieldtype": "Check",
+   "label": "Automatically Fetch Payment Terms"
   }
- ], 
- "has_web_view": 0, 
- "hide_toolbar": 0, 
- "icon": "icon-cog", 
- "idx": 1, 
- "in_create": 0, 
- "is_submittable": 0, 
- "issingle": 1, 
- "istable": 0, 
- "max_attachments": 0, 
- "modified": "2019-04-06 12:28:43.026250", 
- "modified_by": "Administrator", 
- "module": "Accounts", 
- "name": "Accounts Settings", 
- "owner": "Administrator", 
+ ],
+ "icon": "icon-cog",
+ "idx": 1,
+ "issingle": 1,
+ "modified": "2019-04-28 18:20:55.789946",
+ "modified_by": "Administrator",
+ "module": "Accounts",
+ "name": "Accounts Settings",
+ "owner": "Administrator",
  "permissions": [
   {
-   "amend": 0, 
-   "cancel": 0, 
-   "create": 1, 
-   "delete": 0, 
-   "email": 1, 
-   "export": 0, 
-   "if_owner": 0, 
-   "import": 0, 
-   "permlevel": 0, 
-   "print": 1, 
-   "read": 1, 
-   "report": 0, 
-   "role": "Accounts Manager", 
-   "set_user_permissions": 0, 
-   "share": 1, 
-   "submit": 0, 
+   "create": 1,
+   "email": 1,
+   "print": 1,
+   "read": 1,
+   "role": "Accounts Manager",
+   "share": 1,
    "write": 1
-  }, 
+  },
   {
-   "amend": 0, 
-   "cancel": 0, 
-   "create": 0, 
-   "delete": 0, 
-   "email": 0, 
-   "export": 0, 
-   "if_owner": 0, 
-   "import": 0, 
-   "permlevel": 0, 
-   "print": 0, 
-   "read": 1, 
-   "report": 0, 
-   "role": "Sales User", 
-   "set_user_permissions": 0, 
-   "share": 0, 
-   "submit": 0, 
-   "write": 0
-  }, 
+   "read": 1,
+   "role": "Sales User"
+  },
   {
-   "amend": 0, 
-   "cancel": 0, 
-   "create": 0, 
-   "delete": 0, 
-   "email": 0, 
-   "export": 0, 
-   "if_owner": 0, 
-   "import": 0, 
-   "permlevel": 0, 
-   "print": 0, 
-   "read": 1, 
-   "report": 0, 
-   "role": "Purchase User", 
-   "set_user_permissions": 0, 
-   "share": 0, 
-   "submit": 0, 
-   "write": 0
+   "read": 1,
+   "role": "Purchase User"
   }
- ], 
- "quick_entry": 1, 
- "read_only": 0, 
- "show_name_in_global_search": 0, 
- "sort_order": "ASC", 
- "track_changes": 1, 
- "track_seen": 0, 
- "track_views": 0
+ ],
+ "quick_entry": 1,
+ "sort_order": "ASC",
+ "track_changes": 1
 }
\ No newline at end of file
diff --git a/erpnext/buying/doctype/purchase_order/purchase_order.py b/erpnext/buying/doctype/purchase_order/purchase_order.py
index e5156a3..ecc9e37 100644
--- a/erpnext/buying/doctype/purchase_order/purchase_order.py
+++ b/erpnext/buying/doctype/purchase_order/purchase_order.py
@@ -403,7 +403,7 @@
 			or item.get("buying_cost_center")
 			or item_group.get("buying_cost_center"))
 
-	doc = get_mapped_doc("Purchase Order", source_name,	{
+	fields = {
 		"Purchase Order": {
 			"doctype": "Purchase Invoice",
 			"field_map": {
@@ -426,8 +426,16 @@
 		"Purchase Taxes and Charges": {
 			"doctype": "Purchase Taxes and Charges",
 			"add_if_empty": True
+		},
+	}
+
+	if frappe.get_single("Accounts Settings").automatically_fetch_payment_terms == 1:
+		fields["Payment Schedule"] = {
+			"doctype": "Payment Schedule",
+			"add_if_empty": True
 		}
-	}, target_doc, postprocess)
+
+	doc = get_mapped_doc("Purchase Order", source_name,	fields, target_doc, postprocess)
 
 	return doc
 
diff --git a/erpnext/buying/doctype/purchase_order/test_purchase_order.py b/erpnext/buying/doctype/purchase_order/test_purchase_order.py
index 3454908..812aad8 100644
--- a/erpnext/buying/doctype/purchase_order/test_purchase_order.py
+++ b/erpnext/buying/doctype/purchase_order/test_purchase_order.py
@@ -6,7 +6,7 @@
 import frappe
 import frappe.defaults
 from erpnext.accounts.doctype.payment_entry.payment_entry import get_payment_entry
-from frappe.utils import flt, add_days, nowdate
+from frappe.utils import flt, add_days, nowdate, getdate
 from erpnext.stock.doctype.item.test_item import make_item
 from erpnext.buying.doctype.purchase_order.purchase_order import (make_purchase_receipt, make_purchase_invoice, make_rm_stock_entry as make_subcontract_transfer_entry)
 from erpnext.stock.doctype.material_request.test_material_request import make_material_request
@@ -142,9 +142,9 @@
 		po.submit()
 
 		self.assertEqual(po.payment_schedule[0].payment_amount, 2500.0)
-		self.assertEqual(po.payment_schedule[0].due_date, po.transaction_date)
+		self.assertEqual(getdate(po.payment_schedule[0].due_date), getdate(po.transaction_date))
 		self.assertEqual(po.payment_schedule[1].payment_amount, 2500.0)
-		self.assertEqual(po.payment_schedule[1].due_date, add_days(po.transaction_date, 30))
+		self.assertEqual(getdate(po.payment_schedule[1].due_date), add_days(getdate(po.transaction_date), 30))
 		pi = make_purchase_invoice(po.name)
 		pi.save()
 
@@ -152,9 +152,9 @@
 		self.assertEqual(len(pi.get("items", [])), 1)
 
 		self.assertEqual(pi.payment_schedule[0].payment_amount, 2500.0)
-		self.assertEqual(pi.payment_schedule[0].due_date, po.transaction_date)
+		self.assertEqual(getdate(pi.payment_schedule[0].due_date), getdate(po.transaction_date))
 		self.assertEqual(pi.payment_schedule[1].payment_amount, 2500.0)
-		self.assertEqual(pi.payment_schedule[1].due_date, add_days(po.transaction_date, 30))
+		self.assertEqual(getdate(pi.payment_schedule[1].due_date), add_days(getdate(po.transaction_date), 30))
 
 	def test_subcontracting(self):
 		po = create_purchase_order(item_code="_Test FG Item", is_subcontracted="Yes")
@@ -303,6 +303,10 @@
 		make_stock_entry(target="_Test Warehouse - _TC", qty=10, basic_rate=100)
 		make_stock_entry(target="_Test Warehouse - _TC", item_code="_Test Item Home Desktop 100",
 			qty=20, basic_rate=100)
+		make_stock_entry(target="_Test Warehouse 1 - _TC", item_code="_Test Item",
+			qty=30, basic_rate=100)
+		make_stock_entry(target="_Test Warehouse 1 - _TC", item_code="_Test Item Home Desktop 100",
+			qty=30, basic_rate=100)
 
 		bin1 = frappe.db.get_value("Bin",
 			filters={"warehouse": "_Test Warehouse - _TC", "item_code": "_Test Item"},
@@ -349,6 +353,11 @@
 
 		self.assertEquals(bin5.reserved_qty_for_sub_contract, bin2.reserved_qty_for_sub_contract - 6)
 
+		make_stock_entry(target="_Test Warehouse 1 - _TC", item_code="_Test Item",
+			qty=40, basic_rate=100)
+		make_stock_entry(target="_Test Warehouse 1 - _TC", item_code="_Test Item Home Desktop 100",
+			qty=40, basic_rate=100)
+
 		# make Purchase Receipt against PO
 		pr = make_purchase_receipt(po.name)
 		pr.supplier_warehouse = "_Test Warehouse 1 - _TC"