How to Find User Exit for a Transaction Code

Sometimes we have difficulties how to find user exit for a specific transaction, especially for new abap programmer. Here I share an abap program that can help us find the user exit based on inputted transaction code. Just create new abap program in your local environment, copy the following program, save and activate.

REPORT  ZUSEREXIT no standard page heading.
tables : tstc, tadir, modsapt, modact,
           trdir, tfdir, enlfdir, tstct.
data : jtab like tadir occurs 0 with header line.
data : field1(30).
data : v_devclass like tadir-devclass.
parameters : p_tcode like tstc-tcode obligatory.
select single * from tstc where tcode eq p_tcode.
if sy-subrc eq 0.
   select single * from tadir where pgmid = 'R3TR'
                    and object = 'PROG'
                    and obj_name = tstc-pgmna.
   move : tadir-devclass to v_devclass.
      if sy-subrc ne 0.
         select single * from trdir where name = tstc-pgmna.
         if trdir-subc eq 'F'.
            select single * from tfdir
                where pname = tstc-pgmna.
            select single * from enlfdir
                where funcname =
            tfdir-funcname.
            select single * from tadir where pgmid = 'R3TR'
                               and object = 'FUGR'
                               and obj_name eq enlfdir-area.
            move : tadir-devclass to v_devclass.
          endif.
       endif.
       select * from tadir into table jtab
                     where pgmid = 'R3TR'
                       and object = 'SMOD'
                       and devclass = v_devclass.
        select single * from tstct
            where sprsl eq sy-langu and
                     tcode eq p_tcode.
        format color col_positive intensified off.
        write:/(19) 'Transaction Code - ',
             20(20) p_tcode,
             45(50) tstct-ttext.
                    skip.
        if not jtab[] is initial.
           write:/(95) sy-uline.
           format color col_heading intensified on.
           write:/1 sy-vline,
                  2 'Exit Name',
                 21 sy-vline ,
                 22 'Description',
                 95 sy-vline.
           write:/(95) sy-uline.
           loop at jtab.
              select single * from modsapt
                     where sprsl = sy-langu and
                            name = jtab-obj_name.
                   format color col_normal intensified off.
                   write:/1 sy-vline,
                          2 jtab-obj_name hotspot on,
                         21 sy-vline ,
                         22 modsapt-modtext,
                         95 sy-vline.
           endloop.
           write:/(95) sy-uline.
           describe table jtab.
           skip.
           format color col_total intensified on.
           write:/ 'No of Exits:' , sy-tfill.
        else.
           format color col_negative intensified on.
           write:/(95) 'No User Exit exists'.
        endif.
      else.
          format color col_negative intensified on.
          write:/(95) 'Transaction Code Does Not Exist'.
      endif.
at line-selection.
   get cursor field field1.
   check field1(4) eq 'JTAB'.
   set parameter id 'MON' field sy-lisel+1(10).
   call transaction 'SMOD' and skip first   screen.

Following are captured images while program executed and the results.

The program actually finds any type SMOD user exit that available for any transaction code.