Is it possible to show the running total when entering manual receipts

Summary:

Client receives monies from a customer for various invoices. When they create the manual receipt the receipted amount is entered. But when the individual invoices are added to the receipt they would like to have the running total of the invoices already matched to the receipt shown. Is that possible?

Content (required):

Client receives monies from a customer for various invoices. When they create the manual receipt the receipted amount is entered. But when the individual invoices are added to the receipt they would like to have the running total of the invoices already matched to the receipt shown. Is that possible?