diff --git a/erpnext/accounts/doctype/gl_entry/gl_entry.json b/erpnext/accounts/doctype/gl_entry/gl_entry.json
index 6d772a6..14b3c58 100644
--- a/erpnext/accounts/doctype/gl_entry/gl_entry.json
+++ b/erpnext/accounts/doctype/gl_entry/gl_entry.json
@@ -193,7 +193,7 @@
  "icon": "icon-list", 
  "idx": 1, 
  "in_create": 1, 
- "modified": "2015-06-14 20:57:19.800276", 
+ "modified": "2015-07-09 15:51:04.986518", 
  "modified_by": "Administrator", 
  "module": "Accounts", 
  "name": "GL Entry", 
@@ -225,6 +225,19 @@
    "role": "Accounts Manager", 
    "submit": 0, 
    "write": 0
+  }, 
+  {
+   "create": 0, 
+   "delete": 0, 
+   "email": 0, 
+   "export": 1, 
+   "permlevel": 0, 
+   "print": 0, 
+   "read": 1, 
+   "report": 1, 
+   "role": "Auditor", 
+   "share": 0, 
+   "write": 0
   }
  ], 
  "search_fields": "voucher_no,account,posting_date,against_voucher", 
diff --git a/erpnext/accounts/doctype/journal_entry/journal_entry.py b/erpnext/accounts/doctype/journal_entry/journal_entry.py
index 489d488..23d4c73 100644
--- a/erpnext/accounts/doctype/journal_entry/journal_entry.py
+++ b/erpnext/accounts/doctype/journal_entry/journal_entry.py
@@ -3,7 +3,7 @@
 
 from __future__ import unicode_literals
 import frappe
-from frappe.utils import cstr, flt, fmt_money, formatdate, getdate
+from frappe.utils import cstr, flt, fmt_money, formatdate, getdate, date_diff
 from frappe import msgprint, _, scrub
 from erpnext.setup.utils import get_company_currency
 from erpnext.controllers.accounts_controller import AccountsController
@@ -35,7 +35,7 @@
 		self.set_print_format_fields()
 		self.validate_against_sales_order()
 		self.validate_against_purchase_order()
-		self.check_credit_days()
+		self.check_due_date()
 		self.validate_expense_claim()
 		self.validate_credit_debit_note()
 		self.validate_empty_accounts_table()
@@ -88,23 +88,21 @@
 			for customer in customers:
 				check_credit_limit(customer, self.company)
 
-	def check_credit_days(self):
-		from erpnext.accounts.party import get_credit_days
-		posting_date = None
+	def check_due_date(self):
 		if self.cheque_date:
 			for d in self.get("accounts"):
 				if d.party_type and d.party and d.get("credit" if d.party_type=="Customer" else "debit") > 0:
+					due_date = None
 					if d.against_invoice:
-						posting_date = frappe.db.get_value("Sales Invoice", d.against_invoice, "posting_date")
+						due_date = frappe.db.get_value("Sales Invoice", d.against_invoice, "due_date")
 					elif d.against_voucher:
-						posting_date = frappe.db.get_value("Purchase Invoice", d.against_voucher, "posting_date")
+						due_date = frappe.db.get_value("Purchase Invoice", d.against_voucher, "due_date")
 
-					credit_days = get_credit_days(d.party_type, d.party, self.company)
-					if posting_date and credit_days:
-						date_diff = (getdate(self.cheque_date) - getdate(posting_date)).days
-						if  date_diff > flt(credit_days):
-							msgprint(_("Note: Reference Date exceeds allowed credit days by {0} days for {1} {2}")
-								.format(date_diff - flt(credit_days), d.party_type, d.party))
+					if due_date and getdate(self.cheque_date) > getdate(due_date):
+						diff = date_diff(self.cheque_date, due_date)
+						if  diff > 0:
+							msgprint(_("Note: Reference Date exceeds invoice due date by {0} days for {1} {2}")
+								.format(diff, d.party_type, d.party))
 
 	def validate_cheque_info(self):
 		if self.voucher_type in ['Bank Entry']:
diff --git a/erpnext/accounts/doctype/purchase_invoice/purchase_invoice.js b/erpnext/accounts/doctype/purchase_invoice/purchase_invoice.js
index d404851..07dbf72 100644
--- a/erpnext/accounts/doctype/purchase_invoice/purchase_invoice.js
+++ b/erpnext/accounts/doctype/purchase_invoice/purchase_invoice.js
@@ -68,7 +68,7 @@
 
 		}
 	},
-
+	
 	supplier: function() {
 		var me = this;
 		if(this.frm.updating_party_details)
diff --git a/erpnext/accounts/doctype/sales_invoice/sales_invoice.py b/erpnext/accounts/doctype/sales_invoice/sales_invoice.py
index f3acc74..829478d 100644
--- a/erpnext/accounts/doctype/sales_invoice/sales_invoice.py
+++ b/erpnext/accounts/doctype/sales_invoice/sales_invoice.py
@@ -138,7 +138,7 @@
 
 		if not self.debit_to:
 			self.debit_to = get_party_account(self.company, self.customer, "Customer")
-		if not self.due_date:
+		if not self.due_date and self.customer:
 			self.due_date = get_due_date(self.posting_date, "Customer", self.customer, self.company)
 
 		super(SalesInvoice, self).set_missing_values(for_validate)
diff --git a/erpnext/accounts/doctype/sales_invoice/test_sales_invoice.py b/erpnext/accounts/doctype/sales_invoice/test_sales_invoice.py
index 63977b7..cf752af 100644
--- a/erpnext/accounts/doctype/sales_invoice/test_sales_invoice.py
+++ b/erpnext/accounts/doctype/sales_invoice/test_sales_invoice.py
@@ -5,6 +5,7 @@
 import frappe
 import unittest, copy
 import time
+from frappe.utils import nowdate, add_days
 from erpnext.accounts.utils import get_stock_and_account_difference
 from erpnext.stock.doctype.purchase_receipt.test_purchase_receipt import set_perpetual_inventory
 from erpnext.projects.doctype.time_log_batch.test_time_log_batch import *
@@ -756,14 +757,27 @@
 
 		# hack! because stock ledger entires are already inserted and are not rolled back!
 		self.assertRaises(SerialNoDuplicateError, si.cancel)
+		
+	def test_invoice_due_date_against_customers_credit_days(self):
+		# set customer's credit days
+		frappe.db.set_value("Customer", "_Test Customer", "credit_days_based_on", "Fixed Days")
+		frappe.db.set_value("Customer", "_Test Customer", "credit_days", 10)
+		
+		si = create_sales_invoice()
+		self.assertEqual(si.due_date, add_days(nowdate(), 10))
+		
+		# set customer's credit days is last day of the next month
+		frappe.db.set_value("Customer", "_Test Customer", "credit_days_based_on", "Last Day of the Next Month")
+		
+		si1 = create_sales_invoice(posting_date="2015-07-05")		
+		self.assertEqual(si1.due_date, "2015-08-31")
+		
 
 def create_sales_invoice(**args):
 	si = frappe.new_doc("Sales Invoice")
 	args = frappe._dict(args)
 	if args.posting_date:
-		si.posting_date = args.posting_date
-	if args.posting_time:
-		si.posting_time = args.posting_time
+		si.posting_date = args.posting_date or nowdate()
 
 	si.company = args.company or "_Test Company"
 	si.customer = args.customer or "_Test Customer"
diff --git a/erpnext/accounts/party.py b/erpnext/accounts/party.py
index 08402f3..0bf014b 100644
--- a/erpnext/accounts/party.py
+++ b/erpnext/accounts/party.py
@@ -4,9 +4,10 @@
 from __future__ import unicode_literals
 
 import frappe
+import datetime
 from frappe import _, msgprint, scrub
 from frappe.defaults import get_user_permissions
-from frappe.utils import add_days, getdate, formatdate, flt
+from frappe.utils import add_days, getdate, formatdate, flt, get_first_day, date_diff, nowdate
 from erpnext.utilities.doctype.address.address import get_address_display
 from erpnext.utilities.doctype.contact.contact import get_contact_details
 
@@ -158,43 +159,54 @@
 
 		return account
 
+@frappe.whitelist()
 def get_due_date(posting_date, party_type, party, company):
 	"""Set Due Date = Posting Date + Credit Days"""
 	due_date = None
-	if posting_date:
-		credit_days = get_credit_days(party_type, party, company)
-		due_date = add_days(posting_date, credit_days) if credit_days else posting_date
-
+	if posting_date and party:
+		due_date = posting_date
+		if party_type=="Customer":
+			credit_days_based_on, credit_days = get_credit_days(party_type, party, company)
+			if credit_days_based_on == "Fixed Days" and credit_days:
+				due_date = add_days(posting_date, credit_days)
+			elif credit_days_based_on == "Last Day of the Next Month":
+				due_date = (get_first_day(posting_date, 0, 2) + datetime.timedelta(-1)).strftime("%Y-%m-%d")
+		else:
+			credit_days = get_credit_days(party_type, party, company)
+			if credit_days:
+				due_date = add_days(posting_date, credit_days)
+				
 	return due_date
 
 def get_credit_days(party_type, party, company):
-	if not party:
-		return None
-
-	party_group_doctype = "Customer Group" if party_type=="Customer" else "Supplier Type"
-	credit_days, party_group = frappe.db.get_value(party_type, party, ["credit_days", frappe.scrub(party_group_doctype)])
-
-	if not credit_days:
-		credit_days = frappe.db.get_value(party_group_doctype, party_group, "credit_days") or \
-			frappe.db.get_value("Company", company, "credit_days")
-
-	return credit_days
-
-def validate_due_date(posting_date, due_date, party_type, party, company):
-	credit_days = get_credit_days(party_type, party, company)
-
-	posting_date, due_date = getdate(posting_date), getdate(due_date)
-	diff = (due_date - posting_date).days
-
-	if diff < 0:
-		frappe.throw(_("Due Date cannot be before Posting Date"))
-	elif credit_days is not None and diff > flt(credit_days):
-		is_credit_controller = frappe.db.get_value("Accounts Settings", None,
-			"credit_controller") in frappe.get_roles()
-
-		if is_credit_controller:
-			msgprint(_("Note: Due / Reference Date exceeds allowed customer credit days by {0} day(s)")
-				.format(diff - flt(credit_days)))
+	if party_type and party:
+		if party_type == "Customer":
+			credit_days_based_on, credit_days, customer_group = \
+				frappe.db.get_value(party_type, party, ["credit_days_based_on", "credit_days", "customer_group"])
+			
+			if not credit_days_based_on:
+				credit_days_based_on, credit_days = \
+					frappe.db.get_value("Customer Group", customer_group, ["credit_days_based_on", "credit_days"]) \
+					or frappe.db.get_value("Company", company, ["credit_days_based_on", "credit_days"])
+				
+			return credit_days_based_on, credit_days
 		else:
-			max_due_date = formatdate(add_days(posting_date, credit_days))
-			frappe.throw(_("Due / Reference Date cannot be after {0}").format(max_due_date))
+			credit_days, supplier_type = frappe.db.get_value(party_type, party, ["credit_days", "supplier_type"])
+			if not credit_days:
+				credit_days = frappe.db.get_value("Supplier Type", supplier_type, "credit_days") \
+					or frappe.db.get_value("Company", company, "credit_days")
+					
+			return credit_days
+			
+def validate_due_date(posting_date, due_date, party_type, party, company):
+	if getdate(due_date) < getdate(posting_date):
+		frappe.throw(_("Due Date cannot be before Posting Date"))
+	else:
+		default_due_date = get_due_date(posting_date, party_type, party, company)
+		if getdate(due_date) > getdate(default_due_date):
+			is_credit_controller = frappe.db.get_single_value("Accounts Settings", "credit_controller") in frappe.get_roles()
+			if is_credit_controller:
+				msgprint(_("Note: Due / Reference Date exceeds allowed customer credit days by {0} day(s)")
+					.format(date_diff(due_date, default_due_date)))
+			else:
+				frappe.throw(_("Due / Reference Date cannot be after {0}").format(formatdate(default_due_date)))
\ No newline at end of file
diff --git a/erpnext/patches.txt b/erpnext/patches.txt
index b21d31b..f3282f7 100644
--- a/erpnext/patches.txt
+++ b/erpnext/patches.txt
@@ -171,3 +171,4 @@
 erpnext.patches.v5_0.item_variants
 erpnext.patches.v5_0.update_item_desc_in_invoice
 erpnext.patches.v5_1.fix_against_account
+erpnext.patches.v5_1.fix_credit_days_based_on
\ No newline at end of file
diff --git a/erpnext/patches/v5_1/fix_credit_days_based_on.py b/erpnext/patches/v5_1/fix_credit_days_based_on.py
new file mode 100644
index 0000000..f9c91f8
--- /dev/null
+++ b/erpnext/patches/v5_1/fix_credit_days_based_on.py
@@ -0,0 +1,9 @@
+from __future__ import unicode_literals
+
+import frappe
+
+def execute():
+	for dt in ("Customer", "Customer Group", "Company"):
+		frappe.reload_doctype(dt)
+		frappe.db.sql("""update `tab{0}` set credit_days_based_on='Fixed Days'
+			where ifnull(credit_days, 0) > 0""".format(dt))
\ No newline at end of file
diff --git a/erpnext/public/js/controllers/transaction.js b/erpnext/public/js/controllers/transaction.js
index 91601a4..953800d 100644
--- a/erpnext/public/js/controllers/transaction.js
+++ b/erpnext/public/js/controllers/transaction.js
@@ -14,7 +14,6 @@
 
 			$.each({
 				posting_date: today,
-				due_date: today,
 				transaction_date: today,
 				currency: currency,
 				price_list_currency: currency,
@@ -255,7 +254,29 @@
 	},
 
 	posting_date: function() {
-		erpnext.get_fiscal_year(this.frm.doc.company, this.frm.doc.posting_date);
+		var me = this;
+		if (this.frm.doc.posting_date) {
+			if ((this.frm.doc.doctype == "Sales Invoice" && this.frm.doc.customer) || 
+				(this.frm.doc.doctype == "Purchase Invoice" && this.frm.doc.supplier)) {
+				return frappe.call({
+					method: "erpnext.accounts.party.get_due_date",
+					args: {
+						"posting_date": me.frm.doc.posting_date,
+						"party_type": me.frm.doc.doctype == "Sales Invoice" ? "Customer" : "Supplier",
+						"party": me.frm.doc.doctype == "Sales Invoice" ? me.frm.doc.customer : me.frm.doc.supplier,
+						"company": me.frm.doc.company
+					}, 
+					callback: function(r, rt) {
+						if(r.message) {
+							me.frm.set_value("due_date", r.message);
+						}
+						erpnext.get_fiscal_year(me.frm.doc.company, me.frm.doc.posting_date);
+					}
+				})
+			} else {
+				erpnext.get_fiscal_year(me.frm.doc.company, me.frm.doc.posting_date);
+			}
+		}
 	},
 
 	get_company_currency: function() {
diff --git a/erpnext/selling/doctype/customer/customer.json b/erpnext/selling/doctype/customer/customer.json
index f281175..edae9b4 100644
--- a/erpnext/selling/doctype/customer/customer.json
+++ b/erpnext/selling/doctype/customer/customer.json
@@ -1,366 +1,375 @@
 {
- "allow_import": 1,
- "allow_rename": 1,
- "autoname": "naming_series:",
- "creation": "2013-06-11 14:26:44",
- "description": "Buyer of Goods and Services.",
- "docstatus": 0,
- "doctype": "DocType",
- "document_type": "Master",
+ "allow_import": 1, 
+ "allow_rename": 1, 
+ "autoname": "naming_series:", 
+ "creation": "2013-06-11 14:26:44", 
+ "description": "Buyer of Goods and Services.", 
+ "docstatus": 0, 
+ "doctype": "DocType", 
+ "document_type": "Master", 
  "fields": [
   {
-   "fieldname": "basic_info",
-   "fieldtype": "Section Break",
-   "label": "",
-   "oldfieldtype": "Section Break",
-   "options": "icon-user",
-   "permlevel": 0,
+   "fieldname": "basic_info", 
+   "fieldtype": "Section Break", 
+   "label": "", 
+   "oldfieldtype": "Section Break", 
+   "options": "icon-user", 
+   "permlevel": 0, 
    "reqd": 0
-  },
+  }, 
   {
-   "fieldname": "naming_series",
-   "fieldtype": "Select",
-   "label": "Series",
-   "no_copy": 1,
-   "options": "CUST-",
-   "permlevel": 0,
+   "fieldname": "naming_series", 
+   "fieldtype": "Select", 
+   "label": "Series", 
+   "no_copy": 1, 
+   "options": "CUST-", 
+   "permlevel": 0, 
    "print_hide": 0
-  },
+  }, 
   {
-   "fieldname": "customer_name",
-   "fieldtype": "Data",
-   "hidden": 0,
-   "in_filter": 1,
-   "in_list_view": 0,
-   "label": "Full Name",
-   "no_copy": 1,
-   "oldfieldname": "customer_name",
-   "oldfieldtype": "Data",
-   "permlevel": 0,
-   "print_hide": 0,
-   "report_hide": 0,
-   "reqd": 1,
+   "fieldname": "customer_name", 
+   "fieldtype": "Data", 
+   "hidden": 0, 
+   "in_filter": 1, 
+   "in_list_view": 0, 
+   "label": "Full Name", 
+   "no_copy": 1, 
+   "oldfieldname": "customer_name", 
+   "oldfieldtype": "Data", 
+   "permlevel": 0, 
+   "print_hide": 0, 
+   "report_hide": 0, 
+   "reqd": 1, 
    "search_index": 1
-  },
+  }, 
   {
-   "fieldname": "customer_type",
-   "fieldtype": "Select",
-   "label": "Type",
-   "oldfieldname": "customer_type",
-   "oldfieldtype": "Select",
-   "options": "\nCompany\nIndividual",
-   "permlevel": 0,
+   "fieldname": "customer_type", 
+   "fieldtype": "Select", 
+   "label": "Type", 
+   "oldfieldname": "customer_type", 
+   "oldfieldtype": "Select", 
+   "options": "\nCompany\nIndividual", 
+   "permlevel": 0, 
    "reqd": 1
-  },
+  }, 
   {
-   "fieldname": "lead_name",
-   "fieldtype": "Link",
-   "hidden": 0,
-   "in_filter": 1,
-   "label": "From Lead",
-   "no_copy": 1,
-   "oldfieldname": "lead_name",
-   "oldfieldtype": "Link",
-   "options": "Lead",
-   "permlevel": 0,
-   "print_hide": 1,
+   "fieldname": "lead_name", 
+   "fieldtype": "Link", 
+   "hidden": 0, 
+   "in_filter": 1, 
+   "label": "From Lead", 
+   "no_copy": 1, 
+   "oldfieldname": "lead_name", 
+   "oldfieldtype": "Link", 
+   "options": "Lead", 
+   "permlevel": 0, 
+   "print_hide": 1, 
    "report_hide": 1
-  },
+  }, 
   {
-   "fieldname": "column_break0",
-   "fieldtype": "Column Break",
-   "permlevel": 0,
+   "fieldname": "column_break0", 
+   "fieldtype": "Column Break", 
+   "permlevel": 0, 
    "width": "50%"
-  },
+  }, 
   {
-   "description": "",
-   "fieldname": "customer_group",
-   "fieldtype": "Link",
-   "hidden": 0,
-   "in_filter": 1,
-   "in_list_view": 1,
-   "label": "Customer Group",
-   "oldfieldname": "customer_group",
-   "oldfieldtype": "Link",
-   "options": "Customer Group",
-   "permlevel": 0,
-   "print_hide": 0,
-   "reqd": 1,
+   "description": "", 
+   "fieldname": "customer_group", 
+   "fieldtype": "Link", 
+   "hidden": 0, 
+   "in_filter": 1, 
+   "in_list_view": 1, 
+   "label": "Customer Group", 
+   "oldfieldname": "customer_group", 
+   "oldfieldtype": "Link", 
+   "options": "Customer Group", 
+   "permlevel": 0, 
+   "print_hide": 0, 
+   "reqd": 1, 
    "search_index": 1
-  },
+  }, 
   {
-   "description": "",
-   "fieldname": "territory",
-   "fieldtype": "Link",
-   "in_list_view": 1,
-   "label": "Territory",
-   "oldfieldname": "territory",
-   "oldfieldtype": "Link",
-   "options": "Territory",
-   "permlevel": 0,
-   "print_hide": 1,
+   "description": "", 
+   "fieldname": "territory", 
+   "fieldtype": "Link", 
+   "in_list_view": 1, 
+   "label": "Territory", 
+   "oldfieldname": "territory", 
+   "oldfieldtype": "Link", 
+   "options": "Territory", 
+   "permlevel": 0, 
+   "print_hide": 1, 
    "reqd": 1
-  },
+  }, 
   {
-   "depends_on": "eval:!doc.__islocal",
-   "fieldname": "address_contacts",
-   "fieldtype": "Section Break",
-   "label": "",
-   "options": "icon-map-marker",
+   "depends_on": "eval:!doc.__islocal", 
+   "fieldname": "address_contacts", 
+   "fieldtype": "Section Break", 
+   "label": "", 
+   "options": "icon-map-marker", 
    "permlevel": 0
-  },
+  }, 
   {
-   "fieldname": "address_html",
-   "fieldtype": "HTML",
-   "label": "Address HTML",
-   "permlevel": 0,
+   "fieldname": "address_html", 
+   "fieldtype": "HTML", 
+   "label": "Address HTML", 
+   "permlevel": 0, 
    "read_only": 1
-  },
+  }, 
   {
-   "fieldname": "column_break1",
-   "fieldtype": "Column Break",
-   "permlevel": 0,
+   "fieldname": "column_break1", 
+   "fieldtype": "Column Break", 
+   "permlevel": 0, 
    "width": "50%"
-  },
+  }, 
   {
-   "fieldname": "contact_html",
-   "fieldtype": "HTML",
-   "label": "Contact HTML",
-   "oldfieldtype": "HTML",
-   "permlevel": 0,
+   "fieldname": "contact_html", 
+   "fieldtype": "HTML", 
+   "label": "Contact HTML", 
+   "oldfieldtype": "HTML", 
+   "permlevel": 0, 
    "read_only": 1
-  },
+  }, 
   {
-   "fieldname": "default_receivable_accounts",
-   "fieldtype": "Section Break",
-   "label": "Default Receivable Accounts",
+   "fieldname": "default_receivable_accounts", 
+   "fieldtype": "Section Break", 
+   "label": "Default Receivable Accounts", 
    "permlevel": 0
-  },
+  }, 
   {
-   "depends_on": "eval:!doc.__islocal",
-   "description": "Mention if non-standard receivable account applicable",
-   "fieldname": "accounts",
-   "fieldtype": "Table",
-   "label": "Accounts",
-   "options": "Party Account",
+   "depends_on": "eval:!doc.__islocal", 
+   "description": "Mention if non-standard receivable account applicable", 
+   "fieldname": "accounts", 
+   "fieldtype": "Table", 
+   "label": "Accounts", 
+   "options": "Party Account", 
    "permlevel": 0
-  },
+  }, 
   {
-   "fieldname": "more_info",
-   "fieldtype": "Section Break",
-   "label": "",
-   "oldfieldtype": "Section Break",
-   "options": "icon-file-text",
+   "fieldname": "more_info", 
+   "fieldtype": "Section Break", 
+   "label": "", 
+   "oldfieldtype": "Section Break", 
+   "options": "icon-file-text", 
    "permlevel": 0
-  },
+  }, 
   {
-   "fieldname": "column_break2",
-   "fieldtype": "Column Break",
-   "permlevel": 0,
+   "fieldname": "column_break2", 
+   "fieldtype": "Column Break", 
+   "permlevel": 0, 
    "width": "50%"
-  },
+  }, 
   {
-   "description": "Your Customer's TAX registration numbers (if applicable) or any general information",
-   "fieldname": "customer_details",
-   "fieldtype": "Text",
-   "label": "Customer Details",
-   "oldfieldname": "customer_details",
-   "oldfieldtype": "Code",
+   "description": "Your Customer's TAX registration numbers (if applicable) or any general information", 
+   "fieldname": "customer_details", 
+   "fieldtype": "Text", 
+   "label": "Customer Details", 
+   "oldfieldname": "customer_details", 
+   "oldfieldtype": "Code", 
    "permlevel": 0
-  },
+  }, 
   {
-   "fieldname": "column_break3",
-   "fieldtype": "Column Break",
-   "permlevel": 0,
+   "fieldname": "column_break3", 
+   "fieldtype": "Column Break", 
+   "permlevel": 0, 
    "width": "50%"
-  },
+  }, 
   {
-   "fieldname": "default_currency",
-   "fieldtype": "Link",
-   "ignore_user_permissions": 1,
-   "label": "Currency",
-   "no_copy": 1,
-   "options": "Currency",
+   "fieldname": "default_currency", 
+   "fieldtype": "Link", 
+   "ignore_user_permissions": 1, 
+   "label": "Currency", 
+   "no_copy": 1, 
+   "options": "Currency", 
    "permlevel": 0
-  },
+  }, 
   {
-   "fieldname": "default_price_list",
-   "fieldtype": "Link",
-   "ignore_user_permissions": 1,
-   "label": "Price List",
-   "options": "Price List",
+   "fieldname": "default_price_list", 
+   "fieldtype": "Link", 
+   "ignore_user_permissions": 1, 
+   "label": "Price List", 
+   "options": "Price List", 
    "permlevel": 0
-  },
+  }, 
   {
-   "fieldname": "default_taxes_and_charges",
-   "fieldtype": "Link",
-   "ignore_user_permissions": 1,
-   "label": "Taxes and Charges",
-   "options": "Sales Taxes and Charges Template",
+   "fieldname": "default_taxes_and_charges", 
+   "fieldtype": "Link", 
+   "ignore_user_permissions": 1, 
+   "label": "Taxes and Charges", 
+   "options": "Sales Taxes and Charges Template", 
    "permlevel": 0
-  },
+  }, 
   {
-   "fieldname": "credit_days",
-   "fieldtype": "Int",
-   "label": "Credit Days",
-   "oldfieldname": "credit_days",
-   "oldfieldtype": "Int",
+   "fieldname": "credit_days_based_on", 
+   "fieldtype": "Select", 
+   "label": "Credit Days Based On", 
+   "options": "\nFixed Days\nLast Day of the Next Month", 
+   "permlevel": 0, 
+   "precision": ""
+  }, 
+  {
+   "depends_on": "eval:doc.credit_days_based_on=='Fixed Days'", 
+   "fieldname": "credit_days", 
+   "fieldtype": "Int", 
+   "label": "Credit Days", 
+   "oldfieldname": "credit_days", 
+   "oldfieldtype": "Int", 
    "permlevel": 1
-  },
+  }, 
   {
-   "fieldname": "credit_limit",
-   "fieldtype": "Currency",
-   "label": "Credit Limit",
-   "oldfieldname": "credit_limit",
-   "oldfieldtype": "Currency",
-   "options": "Company:company:default_currency",
+   "fieldname": "credit_limit", 
+   "fieldtype": "Currency", 
+   "label": "Credit Limit", 
+   "oldfieldname": "credit_limit", 
+   "oldfieldtype": "Currency", 
+   "options": "Company:company:default_currency", 
    "permlevel": 1
-  },
+  }, 
   {
-   "fieldname": "website",
-   "fieldtype": "Data",
-   "label": "Website",
+   "fieldname": "website", 
+   "fieldtype": "Data", 
+   "label": "Website", 
    "permlevel": 0
-  },
+  }, 
   {
-   "fieldname": "sales_team_section_break",
-   "fieldtype": "Section Break",
-   "label": "",
-   "oldfieldtype": "Section Break",
-   "options": "icon-group",
+   "fieldname": "sales_team_section_break", 
+   "fieldtype": "Section Break", 
+   "label": "", 
+   "oldfieldtype": "Section Break", 
+   "options": "icon-group", 
    "permlevel": 0
-  },
+  }, 
   {
-   "fieldname": "default_sales_partner",
-   "fieldtype": "Link",
-   "ignore_user_permissions": 1,
-   "label": "Sales Partner",
-   "oldfieldname": "default_sales_partner",
-   "oldfieldtype": "Link",
-   "options": "Sales Partner",
+   "fieldname": "default_sales_partner", 
+   "fieldtype": "Link", 
+   "ignore_user_permissions": 1, 
+   "label": "Sales Partner", 
+   "oldfieldname": "default_sales_partner", 
+   "oldfieldtype": "Link", 
+   "options": "Sales Partner", 
    "permlevel": 0
-  },
+  }, 
   {
-   "fieldname": "default_commission_rate",
-   "fieldtype": "Float",
-   "label": "Commission Rate",
-   "oldfieldname": "default_commission_rate",
-   "oldfieldtype": "Currency",
+   "fieldname": "default_commission_rate", 
+   "fieldtype": "Float", 
+   "label": "Commission Rate", 
+   "oldfieldname": "default_commission_rate", 
+   "oldfieldtype": "Currency", 
    "permlevel": 0
-  },
+  }, 
   {
-   "fieldname": "sales_team",
-   "fieldtype": "Table",
-   "label": "Sales Team Details",
-   "oldfieldname": "sales_team",
-   "oldfieldtype": "Table",
-   "options": "Sales Team",
+   "fieldname": "sales_team", 
+   "fieldtype": "Table", 
+   "label": "Sales Team Details", 
+   "oldfieldname": "sales_team", 
+   "oldfieldtype": "Table", 
+   "options": "Sales Team", 
    "permlevel": 0
-  },
+  }, 
   {
-   "fieldname": "communications",
-   "fieldtype": "Table",
-   "hidden": 1,
-   "label": "Communications",
-   "options": "Communication",
-   "permlevel": 0,
+   "fieldname": "communications", 
+   "fieldtype": "Table", 
+   "hidden": 1, 
+   "label": "Communications", 
+   "options": "Communication", 
+   "permlevel": 0, 
    "print_hide": 1
   }
- ],
- "icon": "icon-user",
- "idx": 1,
- "modified": "2015-02-24 17:32:36.065248",
- "modified_by": "Administrator",
- "module": "Selling",
- "name": "Customer",
- "owner": "Administrator",
+ ], 
+ "icon": "icon-user", 
+ "idx": 1, 
+ "modified": "2015-07-09 12:41:31.037121", 
+ "modified_by": "Administrator", 
+ "module": "Selling", 
+ "name": "Customer", 
+ "owner": "Administrator", 
  "permissions": [
   {
-   "amend": 0,
-   "apply_user_permissions": 1,
-   "create": 1,
-   "delete": 0,
-   "email": 1,
-   "permlevel": 0,
-   "print": 1,
-   "read": 1,
-   "report": 1,
-   "role": "Sales User",
-   "share": 1,
-   "submit": 0,
+   "amend": 0, 
+   "apply_user_permissions": 1, 
+   "create": 1, 
+   "delete": 0, 
+   "email": 1, 
+   "permlevel": 0, 
+   "print": 1, 
+   "read": 1, 
+   "report": 1, 
+   "role": "Sales User", 
+   "share": 1, 
+   "submit": 0, 
    "write": 1
-  },
+  }, 
   {
-   "cancel": 0,
-   "delete": 0,
-   "permlevel": 1,
-   "read": 1,
+   "cancel": 0, 
+   "delete": 0, 
+   "permlevel": 1, 
+   "read": 1, 
    "role": "Sales User"
-  },
+  }, 
   {
-   "email": 1,
-   "permlevel": 0,
-   "print": 1,
-   "read": 1,
-   "report": 1,
+   "email": 1, 
+   "permlevel": 0, 
+   "print": 1, 
+   "read": 1, 
+   "report": 1, 
    "role": "Sales Manager"
-  },
+  }, 
   {
-   "amend": 0,
-   "create": 1,
-   "delete": 1,
-   "email": 1,
-   "permlevel": 0,
-   "print": 1,
-   "read": 1,
-   "report": 1,
-   "role": "Sales Master Manager",
-   "set_user_permissions": 1,
-   "share": 1,
-   "submit": 0,
+   "amend": 0, 
+   "create": 1, 
+   "delete": 1, 
+   "email": 1, 
+   "permlevel": 0, 
+   "print": 1, 
+   "read": 1, 
+   "report": 1, 
+   "role": "Sales Master Manager", 
+   "set_user_permissions": 1, 
+   "share": 1, 
+   "submit": 0, 
    "write": 1
-  },
+  }, 
   {
-   "cancel": 0,
-   "delete": 0,
-   "permlevel": 1,
-   "read": 1,
-   "role": "Sales Master Manager",
+   "cancel": 0, 
+   "delete": 0, 
+   "permlevel": 1, 
+   "read": 1, 
+   "role": "Sales Master Manager", 
    "write": 1
-  },
+  }, 
   {
-   "email": 1,
-   "permlevel": 0,
-   "print": 1,
-   "read": 1,
-   "report": 1,
+   "email": 1, 
+   "permlevel": 0, 
+   "print": 1, 
+   "read": 1, 
+   "report": 1, 
    "role": "Material User"
-  },
+  }, 
   {
-   "email": 1,
-   "permlevel": 0,
-   "print": 1,
-   "read": 1,
-   "report": 1,
+   "email": 1, 
+   "permlevel": 0, 
+   "print": 1, 
+   "read": 1, 
+   "report": 1, 
    "role": "Material Manager"
-  },
+  }, 
   {
-   "email": 1,
-   "permlevel": 0,
-   "print": 1,
-   "read": 1,
-   "report": 1,
+   "email": 1, 
+   "permlevel": 0, 
+   "print": 1, 
+   "read": 1, 
+   "report": 1, 
    "role": "Accounts User"
-  },
+  }, 
   {
-   "email": 1,
-   "permlevel": 0,
-   "print": 1,
-   "read": 1,
-   "report": 1,
+   "email": 1, 
+   "permlevel": 0, 
+   "print": 1, 
+   "read": 1, 
+   "report": 1, 
    "role": "Accounts Manager"
   }
- ],
- "search_fields": "customer_name,customer_group,territory",
+ ], 
+ "search_fields": "customer_name,customer_group,territory", 
  "title_field": "customer_name"
-}
+}
\ No newline at end of file
diff --git a/erpnext/setup/doctype/company/company.json b/erpnext/setup/doctype/company/company.json
index c2d7073..ca8e694 100644
--- a/erpnext/setup/doctype/company/company.json
+++ b/erpnext/setup/doctype/company/company.json
@@ -246,7 +246,15 @@
    "permlevel": 0
   }, 
   {
-   "depends_on": "eval:!doc.__islocal", 
+   "fieldname": "credit_days_based_on", 
+   "fieldtype": "Select", 
+   "label": "Credit Days Based On", 
+   "options": "\nFixed Days\nLast Day of the Next Month", 
+   "permlevel": 0, 
+   "precision": ""
+  }, 
+  {
+   "depends_on": "eval:(!doc.__islocal && doc.credit_days_based_on=='Fixed Days')", 
    "fieldname": "credit_days", 
    "fieldtype": "Int", 
    "label": "Credit Days", 
@@ -432,7 +440,7 @@
  ], 
  "icon": "icon-building", 
  "idx": 1, 
- "modified": "2015-05-28 12:56:18.175509", 
+ "modified": "2015-07-09 14:20:56.619890", 
  "modified_by": "Administrator", 
  "module": "Setup", 
  "name": "Company", 
diff --git a/erpnext/setup/doctype/customer_group/customer_group.json b/erpnext/setup/doctype/customer_group/customer_group.json
index c6ea98c..732e465 100644
--- a/erpnext/setup/doctype/customer_group/customer_group.json
+++ b/erpnext/setup/doctype/customer_group/customer_group.json
@@ -57,6 +57,15 @@
    "permlevel": 0
   }, 
   {
+   "fieldname": "credit_days_based_on", 
+   "fieldtype": "Select", 
+   "label": "Credit Days Based On", 
+   "options": "\nFixed Days\nLast Day of the Next Month", 
+   "permlevel": 0, 
+   "precision": ""
+  }, 
+  {
+   "depends_on": "eval:doc.credit_days_based_on=='Fixed Days'", 
    "fieldname": "credit_days", 
    "fieldtype": "Int", 
    "label": "Credit Days", 
@@ -128,7 +137,7 @@
  "icon": "icon-sitemap", 
  "idx": 1, 
  "in_create": 0, 
- "modified": "2015-02-24 17:34:40.749511", 
+ "modified": "2015-07-09 12:43:18.846143", 
  "modified_by": "Administrator", 
  "module": "Setup", 
  "name": "Customer Group",