SAP/ABAP: AT SELECTION SCREEN, Radio Button gizler

selection-screen begin of block m1r with frame title text-003.
parameters : _br6 radiobutton group radi modif id pdv,
_br7 radiobutton group radi default 'X' modif id pdv .
selection-screen end of block m1r.

at selection-screen output.
loop at screen.
if screen-group1 = 'PDV'.
screen-input = 0.
screen-invisible = 1.
modify screen.
elseif screen-group1 = 'PDV'.
screen-input = 0.
screen-invisible = 1.
modify screen.
endif.
endloop.