anchor.diff:      CLASS-METHODS:
         is_allowed
           IMPORTING iv_activity       TYPE ty_activity
  +                  iv_param          TYPE string OPTIONAL
           RETURNING VALUE(rv_allowed) TYPE abap_bool.
   
   ENDCLASS.
  
positive.code: 
      TRY.
          CREATE OBJECT li_auth TYPE ('LCL_AUTH_EXIT').
          rv_allowed = li_auth->is_allowed( iv_activity ).
        CATCH cx_sy_create_object_error.
          rv_allowed = abap_true.
      ENDTRY.
  
negative.code:   METHODS:
      is_allowed
        IMPORTING iv_activity       TYPE ty_activity
                  iv_param          TYPE string OPTIONAL
        RETURNING VALUE(rv_allowed) TYPE abap_bool.
  ENDINTERFACE.
  
  