bank_reconciliation: review sanity check assertion

It did not support reconciled internal transactions

bt5/erp5_bank_reconciliation/SkinTemplateItem/portal_skins/erp5_bank_reconciliation/BankReconciliation_reconcileTransactionList.py

@@ -5,13 +5,28 @@ portal = context.getPortalObject()
 portal.portal_selections.updateSelectionCheckedUidList(list_selection_name, listbox_uid, uids)
 selection_uid_list = portal.portal_selections.getSelectionCheckedUidsFor(list_selection_name)
 
+reconciled_bank_account = context.getSourcePayment()
+
 if mode == 'reconcile':
   for line in portal.portal_catalog(uid=selection_uid_list or -1):
     line = line.getObject()
-    if line.getAggregate(portal_type='Bank Reconciliation'):
-      return context.Base_redirect(dialog_id,
+    # Sanity check: line should not already be reconciled.
+    # But what can happen is that this line is an internal transaction line that was
+    # reconciled for payment on one side but not yet on the other side (ex. reconciled
+    # for the bank account used as source_payment, not not bank account used at
+    # destination_payment). So we can accept if the line is already reconciled with a
+    # bank reconciliation, if that bank reconciliation is using another bank account
+    # that the one on this bank reconciliation.
+    # To prevent unauthorized errors, we only consider bank reconciliation users can access.
+    for existing_bank_reconciliation in line.getAggregateValueList(
+          portal_type='Bank Reconciliation',
+          checked_permission='Access contents information'):
+      if existing_bank_reconciliation.getSourcePayment() == reconciled_bank_account:
+        return context.Base_redirect(
+            dialog_id,
             abort_transaction=True,
-                  keep_items={'portal_status_message': translateString("Line Already Reconciled"),
+            keep_items={
+                'portal_status_message': translateString("Line Already Reconciled"),
                 'reset': 1,
                 'cancel_url': cancel_url,
                 'mode': mode,