If the receipt amount is greater than customer debt, search and apply form puts that amount on accou

Hi, I can't find any article related to this topic. If user uses search and apply form in receipt workbench in order to apply one receipt to more than 10 or 20 invoices, and receipt amount is greater than the sum of those invoices, difference is put to OnAccount. Can this be set different, i.e. that amount should be left unapplied, since this is business need. On that way, users are following which customer has overpaid in order to issue him advance invoice or refund him that amount.