Negative Reciever Help Old/New Database

unknown

We recently upgraded to the current version of Visual 7.1.2 from 6.3.8. Well we received a PO in 6.3.8 before the change over and after the change over we discovered the items that we received were no good and need to be returned. We entered the balance of the Orig. PO in the system, but now we need to do a negative receiver so we can return the parts to our vendor for rework/credit. How would we go about doing this? Any feedback would be greatly appreciated.

Thank you