질문1)

화면 0100 ALV LIST가 있을때
T-CODE 입력란 옆의 SAVE 버튼을
T-CODE에 따라 visible, invisible하고 싶은데요..

0100에
process before output.
 module modify_screen_0100.

Z~O01에
module modify_screen_0100 output.
  clear : ok_code.

  case w_mode.   ==> 1)
    when 'SAVE'.
      if  sy-tcode = 'Z~D'.
        loop at screen.

             screen-invisible = 1.
*             screen-input = 0.
            modify screen.
        endloop.
      endif.
    endcase.
endmodule.  

인것 같아 처리했는데 1)부분을 SY-UCOMM, OK_CODE로 해도 NULL이 나오는데요..
고수님들의 의견 부탁 드립니다..  

질문2)
selection-screen begin of block b1 with frame title text-001.

select-options :    s_vkbur  for vbak-vkbur,                  
                    s_vkgrp  for vbak-vkgrp,                      
                    s_kunnr  for vbpa-kunnr,                      
                    s_bstnk  for vbak-bstnk,                      
                    s_remseq for z~5-remseq,                   
                    s_ersda  for z~5-ersda.                    

selection-screen end of block b1.
selection-screen begin of block b2 with frame title text-002.
selection-screen skip 2.
selection-screen comment 01(20) text-003.
selection-screen pushbutton  33(20) save2 user-command push2. <==1)
selection-screen end of block b2.

at selection-screen. 
  perform selection_screen_con.

form selection_screen_con .

  check sy-tcode eq 'Z~N' or sy-tcode eq 'Z~NH'.  <==2)
  loop at screen.
    if screen-name cs 'S_REMSEQ' or screen-name cs 'S_ERSDA'.
      screen-invisible = 1.
      screen-input = 0.
    endif.
    modify screen.
  endloop.

  if sy-ucomm = 'PUSH2'.  <==1)'
    perform push2_init.

    call screen '0220' starting at 4  10
                         ending at 87 27 .                  "60   20.
  endif.

endform.

1)과 1)'를 넣기 전에는 selection layout에서 tcode에 따른 2)의 내용이 잘
적용되었습니다..

그런데 1), 1)'의 push2를 넣은뒤로 2)의 screen-invisible = 1.이 적용이 안되
는데요.. 잘못된 부분을 찾기 힘드네요..