About check box

Question

Hi Experts,
in my selection screen i have 3 check boxes. which maintain such that by default all the check boxes are tick. if i manually select one or two check box that data should be send to mail. which i not sent it should be disable. and should not be sent. to mail . we r using one function module for mail sending. so u give logic for checking the check boxes
my coding is
*screen declare
selection-screen begin of block b1 with frame title text-001.
parameters : p_mail type mail ,
            p_text1 type text1,
            p_text2 type text2,
            p_text3 type text3.
parameters : p_pack as checkbox default 'X',
             p_cer as checkbox default 'X',
             p_com as checkbox default 'X'.
selection-screen end of block b1.
at selection-screen output.
  loop at screen.
        if screen-group1 = '1'.
          if val = 1.
        screen-input = 0.
        modify screen.
      else.
        val = 2.
        screen-input = 1.
        modify screen.
      endif.
    endif.
  endloop.

Answer 1

hi,
in the event START-OF-SELECTION.
if p_pack = 'X'.
fill internla table with the data.....
endif.
if p_cer = 'X'.
append to internla table with the data.....
endif.
if p_com = 'X'.
append to internla table with the data.....
endif.
send the mail.......
thnx
Rk