We have several customers who pay via wire transfer.  Their payment will come through, minus the wire fee, so if their invoice was $400, it would post as $380.  I had created a credit memo to offset the wire charge, but it's not debiting the Bank Fees Expense account.  How should I record the $20 wire fee if I've already recorded the payment (less the wire fee)?  Is there a journal entry I can make to have it charge the expense account?