Is there a command for setting the selection option to be mandatory

hi,
i have a 4 select-option in my program, and i would set that, either one select option must be fill to execute the program. which mean, at least one field ( any select option) have to be enter, or else it will not run. is there a command to restrict on this?
please help. thanks

Check this sample
TABLES : vbap.
SELECT-OPTIONS : so_vbeln FOR vbap-vbeln,
                 so_posnr FOR vbap-posnr.
AT SELECTION-SCREEN.
IF NOT so_vbeln[] IS INITIAL OR
     NOT so_posnr[] IS INITIAL.
ELSE.
    MESSAGE e000(ztest_gopi) WITH 'Atleast one shd be filled'.
ENDIF.
" OR You can do it this way also
TABLES : vbap.
SELECT-OPTIONS : so_vbeln FOR vbap-vbeln,
                 so_posnr FOR vbap-posnr.
AT SELECTION-SCREEN.
IF so_vbeln[] IS INITIAL AND
     so_posnr[] IS INITIAL.
    MESSAGE e000(ztest_gopi) WITH 'Atleast one shd be filled'.
ENDIF.
Regards
Gopi

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