Matching dual unit of measure receipts - answered

Hi all,

my company uses dual unit of measure in the recept process.  For example we receive 100 pieces wheighing 125 Kg.  Vendor sends an invoice for 80 pieces wheighing 100 Kg and three days later he sends an invoice for 20 pieces wheighing 25 Kg.  During voucher match we can change the quantity received but not the wheight received.  The only solution we found so far was to do a reverse receipt and do two different receipts.

Is there another way?  Am I missing some set-up?

PS we are on 8.11 SP1

Thanks a lot in advance