fix: use reference type name to update exc rate

(cherry picked from commit c15690e475)

erpnext/accounts/doctype/payment_entry/payment_entry.py

@@ -338,7 +338,7 @@ class PaymentEntry(AccountsController):
 		self,
 		force: bool = False,
 		update_ref_details_only_for: list | None = None,
-		ref_exchange_rate: float | None = None,
+		reference_exchange_details: dict | None = None,
 	) -> None:
 		for d in self.get("references"):
 			if d.allocated_amount:
@@ -352,8 +352,12 @@ class PaymentEntry(AccountsController):
 				)
 
 				# Only update exchange rate when the reference is Journal Entry
-				if ref_exchange_rate and d.reference_doctype == "Journal Entry":
-					ref_details.update({"exchange_rate": ref_exchange_rate})
+				if (
+					reference_exchange_details
+					and d.reference_doctype == reference_exchange_details.reference_doctype
+					and d.reference_name == reference_exchange_details.reference_name
+				):
+					ref_details.update({"exchange_rate": reference_exchange_details.exchange_rate})
 
 				for field, value in ref_details.items():
 					if d.exchange_gain_loss:

erpnext/accounts/utils.py

@@ -682,7 +682,19 @@ def update_reference_in_payment_entry(
 	payment_entry.setup_party_account_field()
 	payment_entry.set_missing_values()
 	if not skip_ref_details_update_for_pe:
-		payment_entry.set_missing_ref_details(ref_exchange_rate=d.exchange_rate or None)
+		reference_exchange_details = frappe._dict()
+		if d.against_voucher_type == "Journal Entry" and d.exchange_rate:
+			reference_exchange_details.update(
+				{
+					"reference_doctype": d.against_voucher_type,
+					"reference_name": d.against_voucher,
+					"exchange_rate": d.exchange_rate,
+				}
+			)
+		payment_entry.set_missing_ref_details(
+			update_ref_details_only_for=[(d.against_voucher_type, d.against_voucher)],
+			reference_exchange_details=reference_exchange_details,
+		)
 	payment_entry.set_amounts()
 
 	payment_entry.make_exchange_gain_loss_journal(