[Zope] LocalFS and properties

Hello, I tried to add some properties to a LocalFS object with the following code but it didn't work (no properties set), but no error message, too. <dtml-call "rafiles[new_id].manage_addProperty('description', desc, 'string')"> now when I try the management interface and go to the properties tab I can add a new property which also doesn't show up afterwards. I am using Zope 2.3.0 again. Is this a problem with LocalFS and Zope 2.3 or a normal limitation to LocalFS? thanks Oliver