by using RSBDCSUB   we can do this

1.If your using call transaction method the on the syntax 
for call transaction as shown below put "N" as the option 
which stands for no screens.

CALL TRANSACTION 'MM01' USING BDCDATA MODE A/E/N UPDATE A/S 
MESSAGE INTO MESSTAB.

Mode A/E/N stands for A - All screens
                      E - Error screens
                      N - No screens
Update A/S stands for A - Asynchronous
                      S - Synchronous

2.If you use session method go to SM36 to schedule a 
backgroun job.