User exit or Badi For MBRL

Hi all,

I am using a y program which call MBRL t-code in back ground . I need to restrict the t-code MBRL to all user and allow only to use Y program. I can not remove the authorization for MBRL. I found user exit for MBRL but it is in saving time.

Can any help me to finding user exit or badi available before call MBRL initial screen.

Thanks