From 08d8ca0184f19dab13ca77d930baf0dc2db5087e Mon Sep 17 00:00:00 2001
From: tunde <tundebabzy@gmail.com>
Date: Wed, 30 Aug 2017 13:41:07 +0100
Subject: [PATCH] enhance reference_due_date behaviour: - creates new api -
 get_invoice_due_dates - when reference_name is changed, populate
 reference_due_date

---
 .../doctype/journal_entry/journal_entry.js    | 21 +++++++++++++++++++
 .../doctype/journal_entry/journal_entry.py    | 11 ++++++++++
 2 files changed, 32 insertions(+)

diff --git a/erpnext/accounts/doctype/journal_entry/journal_entry.js b/erpnext/accounts/doctype/journal_entry/journal_entry.js
index 9047a4edcc..934dbeb03a 100644
--- a/erpnext/accounts/doctype/journal_entry/journal_entry.js
+++ b/erpnext/accounts/doctype/journal_entry/journal_entry.js
@@ -187,6 +187,24 @@ erpnext.accounts.JournalEntry = frappe.ui.form.Controller.extend({
 
 	reference_name: function(doc, cdt, cdn) {
 		var d = frappe.get_doc(cdt, cdn);
+
+		const get_invoice_due_dates = (invoice_name) => {
+			frappe.call({
+				method: "erpnext.accounts.doctype.journal_entry.journal_entry.get_invoice_due_dates",
+				args: {name: invoice_name},
+				callback: function(r){
+					const wrapper = cur_frm.fields_dict["accounts"].wrapper;
+					const input = $(wrapper).find("select[data-fieldname=reference_due_date]");
+
+					input.children('option').remove();
+
+					$.each(r.message, function(key, value) {
+						input.append(new Option(value.due_date, "", false, false));
+					});
+				}
+			});
+		}
+
 		if(d.reference_name) {
 			if (d.reference_type==="Purchase Invoice" && !flt(d.debit)) {
 				this.get_outstanding('Purchase Invoice', d.reference_name, doc.company, d);
@@ -197,6 +215,9 @@ erpnext.accounts.JournalEntry = frappe.ui.form.Controller.extend({
 			if (d.reference_type==="Journal Entry" && !flt(d.credit) && !flt(d.debit)) {
 				this.get_outstanding('Journal Entry', d.reference_name, doc.company, d);
 			}
+			if( in_list(d.reference_type), ["Sales Invoice", "Purchase Invoice"]) {
+				get_invoice_due_dates(d.reference_name);
+			}
 		}
 	},
 
diff --git a/erpnext/accounts/doctype/journal_entry/journal_entry.py b/erpnext/accounts/doctype/journal_entry/journal_entry.py
index 375d85d1b7..68f4cc53be 100644
--- a/erpnext/accounts/doctype/journal_entry/journal_entry.py
+++ b/erpnext/accounts/doctype/journal_entry/journal_entry.py
@@ -889,3 +889,14 @@ def get_average_exchange_rate(account):
 		exchange_rate = bank_balance_in_company_currency / bank_balance_in_account_currency
 
 	return exchange_rate
+
+
+@frappe.whitelist()
+def get_invoice_due_dates(name):
+	result = frappe.get_list(
+		doctype='GL Entry', group_by='name, due_date',
+		filters={'voucher_no': name, "ifnull(due_date, '')": ('!=', '')},
+		fields=['due_date'], distinct=True
+	)
+
+	return result