hi Sir,
p_chk = 'x' ..by default tick mark is there..so only ajit and sawant user's can untick ...it
so mine is abap when i am untick it it is happening..below is the i have developed as you said..but it is not working.
AT SELECTION-SCREEN OUTPUT.
if sy-uname = 'SAWANT' OR SY-UNAME = 'AJIT'.
ELSE.
loop at screen.
if screen-name CS p_chk.
SCREEN-INPUT = 0.
modify screen.
endif.
endloop.
endif.
regards,
uday