fix(accounts): clear clearance date when amending reconciled voucher

The framework ignores `no_copy` while amending, so a reconciled voucher
carried a stale clearance date into its amendment even though the linked
bank transaction gets unreconciled on cancellation. Reset it via a shared
`before_insert` hook on AccountsController.

Fixes #54909

(cherry picked from commit 1a8d73cbbe)

erpnext/accounts/doctype/bank_transaction/test_bank_transaction.py

@@ -104,6 +104,36 @@ class TestBankTransaction(ERPNextTestSuite):
 		self.assertEqual(bank_transaction.unallocated_amount, 1700)
 		self.assertEqual(bank_transaction.payment_entries, [])
 
+	# Amending a reconciled payment entry must not carry over its clearance date
+	def test_clearance_date_cleared_on_amend(self):
+		bank_transaction = frappe.get_doc(
+			"Bank Transaction",
+			dict(description="1512567 BG/000003025 OPSKATTUZWXXX AT776000000098709849 Herr G"),
+		)
+		payment = frappe.get_doc("Payment Entry", dict(party="Mr G", paid_amount=1700))
+		vouchers = json.dumps(
+			[
+				{
+					"payment_doctype": "Payment Entry",
+					"payment_name": payment.name,
+					"amount": bank_transaction.unallocated_amount,
+				}
+			]
+		)
+		reconcile_vouchers(bank_transaction.name, vouchers)
+
+		self.assertTrue(frappe.db.get_value("Payment Entry", payment.name, "clearance_date"))
+
+		payment.reload()
+		payment.cancel()
+
+		amended = frappe.copy_doc(payment)
+		amended.amended_from = payment.name
+		amended.docstatus = 0
+		amended.insert()
+
+		self.assertFalse(amended.clearance_date)
+
 	# Check if ERPNext can correctly filter a linked payments based on the debit/credit amount
 	def test_debit_credit_output(self):
 		bank_transaction = frappe.get_doc(

erpnext/controllers/accounts_controller.py

@@ -140,6 +140,26 @@ class AccountsController(TransactionBase):
 			if self.doctype in relevant_docs:
 				self.set_payment_schedule()
 
+	def before_insert(self):
+		self.clear_clearance_date_on_amend()
+
+	def clear_clearance_date_on_amend(self):
+		"""Drop the bank reconciliation clearance date copied over while amending.
+
+		The framework copies `no_copy` fields when amending, so a reconciled
+		voucher would carry a stale clearance date into its amendment even though
+		the linked bank transaction gets unreconciled on cancellation.
+		"""
+		if not self.get("amended_from"):
+			return
+
+		if self.meta.has_field("clearance_date"):
+			self.clearance_date = None
+
+		for payment in self.get("payments") or []:
+			if payment.meta.has_field("clearance_date"):
+				payment.clearance_date = None
+
 	def on_update(self):
 		from erpnext.controllers.taxes_and_totals import process_item_wise_tax_details