You are not authorized to use transaction …

Often, when we try to execute a transaction code we end up getting an error message saying ‘You are not authorized to use transaction …’

  

To skip authority check and execute transaction, use Function Module        
                               C160_TRANSACTION_CALL.
Enter transaction code for which you do not have required authorization and execute.

Behind the scene:
Function Module C160_TRANSACTION_CALL makes use of ABAP statement ‘CALL TRANSACTION …’ which doesn’t check the authorization of current user and hence the user is able to execute transaction code without having appropriate authorization.