UserOverRide key on Win2003

I'm trying to OverRide the screeen saver seetings like a do for Win200.

It's configured at:
HKLM\SYSTEM\CCS\Control\Terminal
Server\Winstation\ICA-TCP\USEROVERIDE\Control Panel\Desktop
under this I created
ScreenSaveActive = 0
ScreenSaverIsSecure = 0
ScreenSaveTimeOut = 4500

I'm using under ICA-TCP key, beucase it's for a Citrix server/connection.

But it does not work for Win2003, just for Win2000

any idea?
thanks in advanced..