Hi, I have a Specialist ('OrderingEntities') which creates virtual objects, mapped to existing objects (using ZClass 'Employee') in another Specialist ('Employees'). I want OrderingEntities to add and modify a property 'current_order_id' on the Employee objects. I can get the virtual object to access properties from the real object, but I can't figure out how to implement the property add/change. To make things simpler, I added the property current_order_id to the Employee class, so I can test just modifying this property, leaving creating it for later. OrderingEntities has an employeeRack, set to use the Employee class and to load by accessing attribute current_order_id. The Rack has this SkinScript: WITH Employees.getItem(self.id) COMPUTE original_object=RESULT or NOT_FOUND WITH self.original_object COMPUTE current_order_id WHEN OBJECT ADDED,CHANGED STORE current_order_id USING self.original_object.manage_changeProperties(current_order_id=self.current_order_id) Doing <dtml-var "OrderingEntities.getItem(some_id).current_order_id)"> shows me the value of current_order_id of the Employee object some_id. But I can't figure out how to change the property so it get changed in the Employee object. <dtml-call "OrderingEntities.getItem(some_id).manage_changeProperties(current_order_id='123')"> does nothing, it doesn't even trigger the WHEN OBJECT CHANGED line (not that I really expected it to work... this object is virtual, how can I call changeProperties on it?) Other than figuring out how to get the change to work, I two more problems: -Eventually the OrderingEntities Specialist will have several Racks mapping to several other Specialists, so it will end up returning different classes. Should I instead create a new ZClass with just the current_order_id property and use this class in all the virtual Racks? - How do I add a property to the original object from the virtual object (assuming I did not add it manually to the Employee class)? Do I call self.original_object.manage_addProperty(...) from the SkinScript? TIA -- Itai Tavor "Je sautille, donc je suis." C3Works itai@c3works.com - Kermit the Frog "If you haven't got your health, you haven't got anything"