How to update a custom field in EBAN structure via MD03

dear all,

Kindly help me to determine which exit or badi should i implement,

i try to add a custom field into the EBAN structure (using append structure).

i add a PR creation time into the table, its already worked for PR triggered

from SO and create manually via ME51N, but i had a problem for PR that

created from PP side, MD03, MD04, etc. i could not find the exit/badi.

thanks&regards,

Cahndase