Answer Posted / sunil kumar gautam

This example will be help full for this problem.
PARAMETERS check1 AS CHECKBOX USER-COMMAND check.
select-OPTIONS regio for kna1-regio MODIF ID mad.
select-OPTIONS kunnr for kna1-kunnr MODIF ID kad.
AT SELECTION-SCREEN .
"LOOP AT SCREEN.

if check1 = 'X'.
if kunnr is INITIAL.
Message 'Customer is manditory' type 'E'.
endif.
endif.

if check1 is INITIAL.
if regio is INITIAL.
Message 'Region is manditory' type 'E'.
endif.
endif.

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