Apply Credit Invoices to Selected Invoices Double-Click a line to select it. The negative Unapplied Amount is the amount available to apply (distribute) to open invoices. You should first 'Grab' credit invoice(s) and get an Unapplied Amount. Then select the invoices you wish to apply the credit against. All you are doing is moving money around within the vendor's account. The balance owed is not affected, and nothing is posted to the G/L. Note - applying a credit amount against an open invoice, automatically zeros the discount that could be taken. Also all open amounts listed, disregard discounts.