PO response error : Not Copied to Purchase Order

A user has created a shopping cart - with One-time-vendor - after approval of SHC PO has been created thta has gone into error state - "Error in Process " , cause is missing Vendor Address details.

User wants to delete this PO / SHC, with t-code bbppco01 (PO response) he created an PO response , but this now has status 'Not Copied to Purchase Order'

Any idea for cause and how to solve / fix this