When Combining POs - zeroing out the un-used PO#5

When two or mor POs are combined by Procurement-
zeroing out the quantity in the un-used PO, and leaving the price leaves the PO showing an amount = unit price, Inv Bal = 0.00, Open PO Bal = unit price, accrual = 0.00, Absolute Net = unit price -
This could create problems- need a cleaner way to combine POs