Automatically apply open credits
: Mark this checkbox to have the application automatically apply open credits — such as receipts, credit memos, or write-offs — to a client's invoice when you save it. The application applies the full credit amount, or a partial amount if the invoice total is less than the available credit. The application applies the oldest credits first.
This option is available only if you haven’t enabled the billing approval process. You apply credits automatically with Detail Billing, Quick Bill, Standard Bill, recurring bills, and integrated invoices.