程序查找Customer Exit

REPORT ZEXIT_HELP no standard page heading.

tables : tstc, tadir, modsapt, modact, trdir, tfdir, enlfdir.
tables : 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.