Hi Kumar,
You may develop this BADI in trx se18. In it, you may click 'documentation' to see more details about
this BADI. It only contains one method BBP_B46B_PO_OUTBOUND which is used to map srm PO to ECC PO. You may write the coding according to your requirement.
If you are using extended classic scenario, we usually transfer PO via BAPI BAPI_PO_CREATE1.
There is no need to create RFC.
Best regards,
Ivy
