fix: restrict Party Type/Party to Receivable/Payable accounts in Journal Entry

Journal Entry validation only checked party details when an account was
of type Receivable/Payable, but never restricted setting a Party Type or
Party against accounts of other types. This regressed v14 behavior where
party info could only be captured for Receivable/Payable accounts.

Add a branch to validate_party() that throws when a Party Type or Party
is set on an account that is not Receivable/Payable, with a clear message.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

erpnext/accounts/doctype/journal_entry/journal_entry.py

@@ -484,6 +484,12 @@ class JournalEntry(AccountsController):
 							d.idx, d.account, d.party_type
 						)
 					)
+			elif d.party_type or d.party:
+				frappe.throw(
+					_(
+						"Row {0}: Party Type or Party can only be set for Receivable / Payable account, but account {1} is of type {2}"
+					).format(d.idx, d.account, account_type or _("None"))
+				)
 
 	def check_credit_limit(self):
 		customers = list(

erpnext/accounts/doctype/journal_entry/test_journal_entry.py

@@ -662,6 +662,13 @@ class TestJournalEntry(ERPNextTestSuite):
 		jv.save()
 		self.assertRaises(frappe.ValidationError, jv.submit)
 
+	def test_party_not_allowed_for_non_receivable_payable_account(self):
+		customer = make_customer("_Test New Customer")
+		jv = make_journal_entry(account1="_Test Cash - _TC", account2="_Test Bank - _TC", amount=100, save=False)
+		jv.accounts[0].party_type = "Customer"
+		jv.accounts[0].party = customer
+		self.assertRaises(frappe.ValidationError, jv.save)
+
 	def test_validate_reference_doc_debit_against_sales_order_throws(self):
 		"""Characterize: a debit entry linked to a Sales Order is rejected."""
 		from erpnext.selling.doctype.sales_order.test_sales_order import make_sales_order