Accounting Period Error for External Transactions while unreconciling bank statement line

Summary:

We had a bank statement in April that was matched to a payment and the rounding off difference was released as an external transaction (external transaction was created as a balancing transaction)

Due to some reason, we had to un-reconcile the transaction in May (April period was closed by this time). This voided the external transaction with an accounting date of April. this results in accounting period error.

We really dont want to reopen April to post this. Is there a configuration/setting that can ensure that the void entry has an accounting date same as the date on which un reconcilaition is getting done