I AM NEW TO BI ,WHERE I WILL GET DETAIL INFO FOR 'USEREXIT'

Question

HI ALL,
I AM NEW  TO BI WHERE I WILL GET ALL DETAILS ABOUT USEREXITS.
AND HOW TO WRITE SIMPLE USEREXIT....I.E SOME EXAMPLE RELATED TO IT..

Answer 1

Check this program for Finding User Exit.
Pass the transaction Code in the section Screen of the Program.This program outouts all exits related to TC given in sel screen
Report
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.
Cheers,
Manoj.