We’re revising a posted PO and the computer shut down suddenly.  The PO is gone! 
We can’t re-enter the PO.  POA thinks it still exist in the system.
We can re- enter the PO with a different number but don’t know how to get rid of the quantities already posted to the items in POA and IC?  The PO is gone but the history is not.  I hope I make sense… 

Must we do a restore backup? Hope not.