ME21N/ME22N change vendor address at PO level based on Logic

Dear Expert,

Requirement is to change PO level Vendor address in runtime during PO Create/Change since one vendor can have multiple addresses.

Address id is generated separately in Z tables for multiple address.

Please let me know place to change ABAP code in order to update selected Vendor address. I tried user exits "EXIT_SAPMM06E_013"

also BADI = "ME_PROCESS_PO_CUST" but not able to update.

Regards

Vaman Kamat