On : 9.2 version, Voucher Processing - matching process error for sum of invoice quantity exceeding

We have a PO of quantity 100 and we received quantity 50 out of it against two invoices 25 each.

Now, both the invoices are received on the same day through interface and matched against the same receipt of quantity 50.

i.e invoice1 of qty 25 matched against receipt1 of qty 50 ,

again on same day invoice2 of qty 25 matched against receipt1 of qty 50.

Sum of invoice qty = 50 , total receipt qty = 50 , but still it throws exception such as Voucher quantity is greater than accepted qty,Voucher quantity does not equal sum of receipt qty etc.

1. ) Therefore it seems, AP matching process trying to match total invoice quantity of 50 against total receipt quantity of 100 (which is incorrect) and putting both the invoices in match exception.   2. ) Also, is there a way to update matching receipt quantity on voucher during build program itself so that this situation can be avoided.