voucher match

I am still exploring the new VMA process in release 9.1. I am still trying to under how this would benefit when we match the voucher on occurance of event which would be receipt of invoice from the supplier and someone manually verifying the invoice, packing slip, etc. with the order to confirm that all terms are met to create voucher. Part of this could be automated through OCR, however how would be update the receipts file to match only those receipts which have been verified. There isnt a field in F43121 that would we could log this information.