INVISBLE TEXT IN THE SELECTION SCREEN

HI ALL,

I HAVE LOOP ON SCREEN AT THE SELECTION SCREEN,

AND IT SUPPOSE TO INVISIBLE SOME FIELDS.

THE PROBLEM IS THAT IT IS NOT INVISIBLE THE TEXT.

THE CODE IS ABOVE:

case screen-name.

when 'SO_SAKNR-LOW' OR 'SO_SAKNR-HIGH'.

screen-invisible = 0.

screen-active = 1.

when 'SO_KUNNR-LOW' or 'SO_KUNNR-HIGH'.

screen-invisible = 1.

screen-active = 0.

when 'SO_LIFNR-LOW' or 'SO_LIFNR-HIGH'.

screen-invisible = 1.

screen-active = 0.

endcase.

HOW AM I SUPPOSE TO INVISIBLE THE TEXT TOO?

THANKS,

DANA.