How do I auto populate the Payment Terms in FB01 according to vendor number?

[walkerist79]

Hi, I was trying to populate the Payment Terms according to the vendor number or account number for the first line in FB01. Tried to create a logic in GGB1 but the BSEG inside the custom program was empty. Therefore, I cannot retrieve the vendor number or account number.

Which exit do I need to modify to populate the Payment Terms?

Assuming that the Account or Supplier number is 1234567. I am expected that the payment terms will be auto populated with 1010. However, it is empty. How and where do I create logic for that since it BSEG-LIFNR is not present when the custom logic in GGB1 was called.