Change the system handling of serial numbers.
I added 9 serial numbers to a purchase order and then found that I needed to delete the PO. After deleting it, I am unable to use the same serial numbers on a different PO. This is because, even though they were NEVER actually received, the system still created product instances. When I tried to use the serial numbers on the CORRECT PO, RS informs me that the SN is already in use.