How to pick up a credit against an invoice

KB82

The only way for an invoice or a credit to be “paid off” or “picked up” is to allocate them on a Receipt. A credit is “picked up” against an invoice simply by allocating the credit and the invoice together on the same receipt. The net value of the receipt may in fact end up being zero, simply by allocating a credit to multiple invoices. This will clear them all out but transact no money into your bank account.