[rules-users] Rules firing with an update of another object

Hi everybody! Here is my code and my rule. The problem is that the rule doesn?t detect that my item ?chocolate? contained in the container has moved to the ?office?. I know that if I update the item instead the container it?s working, but I was wondering if there is a solution to detect this movement by this way? Do you have a solution? Thanks! *******CODE ******* session = ruleBase.newStatefulSession(); Location kitchen=new Location("kitchen"); Location office=new Location("office"); Container container1=new Container("container1",kitchen); session.insert(container1); Item chocolate=new Item("chocolate", container1); session.insert(chocolate); session.fireAllRules(); //No rules fired => OK container1.setLocation(office); session.update(session.getFactHandle(container1), container1); session.fireAllRules(); //Once again, no rules fired => Not OK... I want detect this movement *******RULE ******* rule "An item is in the office" salience 0 when $itemA : Item($cont : container, $cont.location.name=="office") then System.out.println("item in office"); end