how can you locate vendor payments that total zero in other words payment records that pay in full

our business practice includes pre-pay for shipments from some of our vendors

we issue a wire transfer

write a check in NS

post a vendor credit

(following best practice for this found in NS documentation)

when the shipment arrives and invoice is created through billing the PO subsequent to Item Receipt

then create vendor payment and select the invoice and the matching vendor credit.

at conclusion invoice state turns to paid in full but the matching payment record can not be found.

I assume because the payment totals zero.

how can these be discovered? and then listed in vendor transactions?