You cannot change the date of the invoive in AP. It will get picked up by your next cheque run.

The biggest problem with fixing this type of error this way is the fact thet between the wrong date of the invoice (Payables) and the correct date of the invoice (Ledger) your Payables to Ledger to be out of balance by the amount of this invoice.

The correct fix would have been to post a credit note against the invoice using the same wrong date and then re-posting the invoice with the correct date.