Invoice Party not getting updated ECC PO

Dear Experts,

                We are facing one issue in ECC PO , require your inputs for resolving the issue.

                We are using SAP ECC 6.0  and SAP SRM 7.0  EHP2 for extended classic scenario.

                PO is transferred from SRM to ECC  when PO is approved.Partner is maintained from SRM side.

                Invoice party is not getting reflected in ECC PO. Its standard functionality . This feature was working

                properly but after some custom enhancement movement it is not working.On creating PO directly via me21

                 we can see Invoice party in PO.

             Kindly suggest solution for this issue,which enhancement could have effected this.Any BADI  name or config ?

      Regards,

     Aditya