How to read checkbox value

hi experts,
I have a reqiurement .If i select certain records  by using the check box and press execute(push button) ,these records must be displayed in next screen but i am facing problem in getting the selected records as the status of checkbox is not getting saved in my internal table.
LOOP AT IT_MAKT INTO WA_MAKT.
    WRITE: / WA_MAKT-CHECK AS CHECKBOX,
             WA_MAKT-MATNR,
             WA_MAKT-MAKTX.
  ENDLOOP.
Please guide me.

hi,
Write code as under:
At user-command [if you want to read check box values based upon button click]
do.
read line sy-index.
[ This will store line contents into sy-lisel ]
if sy-lisel+1(3) = 'X' [ Check box]
   process it.
endif.
if sy-index > 1 and sy-lisel = space.
  exit.
endif.
lv_message = 'Processed successfully'
modify line sy-lilli field value wa_xxxx from lv_message
[ if you want to assign any message after processing]
clear sy-lisel.
enddo.

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