Hi Nihar ;
You can control MB1B WHO is used ....give informations to your friends.
steps :
*SU24 TCODE , You have to select MB1B
*Display fields values---
*note objects and go to SUIM TCODE
** Fulfilled tcode area and authorization objects. like a under screenshoot.
** first column is users who have authorization ME21N in this example.
you can benefit this informations.
thanks.
M.Ozgur UNAL