link posted invoice to newly created purchase order

Hi Gurus,

A purchase order (EX: AA) is created with a wrong WBS. invoice is posted to the PO. later it is found the PO is created with wrong WBS and hence deleted.

A new PO (EX: BB) is created with correct WBS. Now how to link the above posted invoice to the newly created PO, or how to overcome the above situation.

Thanks in advance