If you check this box a field opens to the right where you can enter a specific bank charge for this customer. The customer specific bank charge overrides the default bank charge that can be entered by using the setting Basic fee for bank charge for payment in, under Payments In under the Sales tab in the Settings procedure.
Banks often charge bank charges in connection with international payments. When registering incoming payments in the Register Incoming Payments procedure, you click on Load basic fee if you want to use the default bank charge. The bank charge will then be filled in automatically.