I record the overpayment to a suspense account (set up as a bank account to receive and pay from), then create a bill in the supplier's name for the amount of the refund which is allocated to the suspense account. The refund (now as a bill) can be selected and paid in a batch.
I record the overpayment to a suspense account (set up as a bank account to receive and pay from), then create a bill in the supplier's name for the amount of the refund which is allocated to the suspense account. The refund (now as a bill) can be selected and paid in a batch.