Hi Sachin,
If the buttons are only disabled for some user ids, it could be because of authorization issues.
What you need to do to identify the missing authorization (if any) is after the user executes the transaction, in the same session, using the same logon, execute the transaction sU53. It shall give u a list of all authorizations (objects) missing.
Then you need to inform your basis/authorization team to identify the profile/role to which the authorization object is attached and add the user id to the role.
Hope this helps.
Regards,
Aditya
