Hi Bakti,
If you want to disable the link for group of users then create a custom role(Z:Desc) and implement the BADI BBP_SC_MODIFY_UI.
Use the FM to read the roles for the user.
CALL FUNCTION 'NAVIGATION_SELECT_AGRS_OF_USER'
EXPORTING
USER_NAME = IV_UNAME
TIME_DEPENDENT = 'X'
TABLES
ACTIVITY_GROUPS_USERS = IT_ACTIVITY.
READ TABLE IT_ACTIVITY with key agr_name = Z:Desc.
IF sy-subrc NE 0
is_scr_itmchoice-special_request = space.
ENDIF.
Regards
Praveen