Please let me know the enhancement which can be used before you save a PO. It can be a BADI or an user exit.
I have tried the BADI ME_PROCESS_PO_CUST in ECC.
However, it is not present in 4.6C, which is the version I am using.
Requirement is before saving a PO, it will check for output type, document type, purchase org and vendor. Only if the conditions are checked, the PO will be saved.