Voucher Reversals

We are in the process of upgrading from 9.0 to 9.2 we have been testing the use of Voucher Reversals in 9.0 and have had a couple of issues- often when entering a PO we use the Quantity field to enter the PO amount and a price of 1 to make it easier to enter partiasl receipts. When the Voucher reversal is entered it is not possible to enter e negative quantity so the quantity increases rather than netting off. The other issue is that the Voucher remains matched to the original receipt which leaves an outstanding open committment that