Question about RFBIBL00

I am using RFBIBL00 in a program. It is creating a BDC session, but I need it to process the session also. Right now, it only processes by going to SM35 transaction and clicking process. Can someone please let me know how to get the BDC to process programmatically?

SUBMIT rfbibl00

WITH ds_name = file_path

WITH callmode = 'B'

WITH xlog = 'X'

AND RETURN.