From f0877ffa478d3dd1446b01206cedf896d7b76523 Mon Sep 17 00:00:00 2001
From: barredterra <14891507+barredterra@users.noreply.github.com>
Date: Thu, 14 Dec 2023 13:39:35 +0100
Subject: [PATCH] fix(Payment Entry): don't check empty references

Manual partial backport of https://github.com/frappe/erpnext/pull/36649
---
 .../doctype/payment_entry/payment_entry.py    | 79 ++++++++++---------
 1 file changed, 40 insertions(+), 39 deletions(-)

diff --git a/erpnext/accounts/doctype/payment_entry/payment_entry.py b/erpnext/accounts/doctype/payment_entry/payment_entry.py
index 9575f33fcf3..9bb14b4cfc2 100644
--- a/erpnext/accounts/doctype/payment_entry/payment_entry.py
+++ b/erpnext/accounts/doctype/payment_entry/payment_entry.py
@@ -175,52 +175,53 @@ class PaymentEntry(AccountsController):
 					frappe.throw(fail_message.format(d.idx))
 
 	def validate_allocated_amount_with_latest_data(self):
-		latest_references = get_outstanding_reference_documents(
-			{
-				"posting_date": self.posting_date,
-				"company": self.company,
-				"party_type": self.party_type,
-				"payment_type": self.payment_type,
-				"party": self.party,
-				"party_account": self.paid_from if self.payment_type == "Receive" else self.paid_to,
-				"get_outstanding_invoices": True,
-				"get_orders_to_be_billed": True,
-			}
-		)
+		if self.references:
+			latest_references = get_outstanding_reference_documents(
+				{
+					"posting_date": self.posting_date,
+					"company": self.company,
+					"party_type": self.party_type,
+					"payment_type": self.payment_type,
+					"party": self.party,
+					"party_account": self.paid_from if self.payment_type == "Receive" else self.paid_to,
+					"get_outstanding_invoices": True,
+					"get_orders_to_be_billed": True,
+				}
+			)
 
-		# Group latest_references by (voucher_type, voucher_no)
-		latest_lookup = {}
-		for d in latest_references:
-			d = frappe._dict(d)
-			latest_lookup.update({(d.voucher_type, d.voucher_no): d})
+			# Group latest_references by (voucher_type, voucher_no)
+			latest_lookup = {}
+			for d in latest_references:
+				d = frappe._dict(d)
+				latest_lookup.update({(d.voucher_type, d.voucher_no): d})
 
-		for d in self.get("references"):
-			latest = latest_lookup.get((d.reference_doctype, d.reference_name))
+			for d in self.get("references"):
+				latest = latest_lookup.get((d.reference_doctype, d.reference_name))
 
-			# The reference has already been fully paid
-			if not latest:
-				frappe.throw(
-					_("{0} {1} has already been fully paid.").format(_(d.reference_doctype), d.reference_name)
-				)
-			# The reference has already been partly paid
-			elif latest.outstanding_amount < latest.invoice_amount and flt(
-				d.outstanding_amount, d.precision("outstanding_amount")
-			) != flt(latest.outstanding_amount, d.precision("outstanding_amount")):
+				# The reference has already been fully paid
+				if not latest:
+					frappe.throw(
+						_("{0} {1} has already been fully paid.").format(_(d.reference_doctype), d.reference_name)
+					)
+				# The reference has already been partly paid
+				elif latest.outstanding_amount < latest.invoice_amount and flt(
+					d.outstanding_amount, d.precision("outstanding_amount")
+				) != flt(latest.outstanding_amount, d.precision("outstanding_amount")):
 
-				frappe.throw(
-					_(
-						"{0} {1} has already been partly paid. Please use the 'Get Outstanding Invoice' or the 'Get Outstanding Orders' button to get the latest outstanding amounts."
-					).format(_(d.reference_doctype), d.reference_name)
-				)
+					frappe.throw(
+						_(
+							"{0} {1} has already been partly paid. Please use the 'Get Outstanding Invoice' or the 'Get Outstanding Orders' button to get the latest outstanding amounts."
+						).format(_(d.reference_doctype), d.reference_name)
+					)
 
-			fail_message = _("Row #{0}: Allocated Amount cannot be greater than outstanding amount.")
+				fail_message = _("Row #{0}: Allocated Amount cannot be greater than outstanding amount.")
 
-			if (flt(d.allocated_amount)) > 0 and flt(d.allocated_amount) > flt(latest.outstanding_amount):
-				frappe.throw(fail_message.format(d.idx))
+				if (flt(d.allocated_amount)) > 0 and flt(d.allocated_amount) > flt(latest.outstanding_amount):
+					frappe.throw(fail_message.format(d.idx))
 
-			# Check for negative outstanding invoices as well
-			if flt(d.allocated_amount) < 0 and flt(d.allocated_amount) < flt(latest.outstanding_amount):
-				frappe.throw(fail_message.format(d.idx))
+				# Check for negative outstanding invoices as well
+				if flt(d.allocated_amount) < 0 and flt(d.allocated_amount) < flt(latest.outstanding_amount):
+					frappe.throw(fail_message.format(d.idx))
 
 	def delink_advance_entry_references(self):
 		for reference in self.references: