How to manage obligatory parameters on standard selection screen.

Hi all,
How could I ensure settings some fields-parameters as obligatory on standard selection screen-dynpro1000. I would like to manage this according choosen block. On standard dynpro 1000 I have two blocks for two different selections. Checkboxes ensure which block of selection parameters I want to use. When I check first checkbox I need to set parameters in first block as obligatory and reversely in second block.
Thanks. zd.

Another example...
report zrich_0003.
selection-screen begin of block b1 with frame .
parameters: p_check1 as checkbox user-command chk.
parameters: p_fielda type c modif id gp1.
parameters: p_fieldb type c modif id gp1.
parameters: p_fieldc type c modif id gp1.
selection-screen end of block b1.
selection-screen begin of block b2 with frame .
parameters: p_check2 as checkbox user-command chk.
parameters: p_fieldd type c modif id gp2.
parameters: p_fielde type c modif id gp2.
parameters: p_fieldf type c modif id gp2.
selection-screen end of block b2.
at selection-screen output.
if p_check1 = 'X'.
    loop at screen.
      if screen-group1 = 'GP1'.
        screen-required = '1'.
        modify screen.
      endif.
    endloop.
else.
    loop at screen.
      if screen-group1 = 'GP1'.
        screen-required = '0'.
        modify screen.
      endif.
    endloop.
endif.
if p_check2 = 'X'.
    loop at screen.
      if screen-group1 = 'GP2'.
        screen-required = '1'.
        modify screen.
      endif.
    endloop.
else.
    loop at screen.
      if screen-group1 = 'GP2'.
        screen-required = '0'.
        modify screen.
      endif.
    endloop.
endif.
Regards,
Rich Heilman

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 p2(10) TYPE c,
 p3(10) TYPE c.
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 p5(10) TYPE c MODIF ID bl2,
 p6(10) TYPE c MODIF ID bl2.
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tables : mkpf,mseg,ekko.
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Let me knwo if any doubts.
Reward with points if it helpful
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How to manage obligatory parameters on standard selection screen.

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