[rules-users] how to check reference

Hi, we are using drools version 3.0.6. I want to check the object references of t inserted objects in working memory. How to check the condition in LHS? right now am doing the following way when $obj1:object() $obj2:object() then if($obj1!=$obj2) System.out.println("Fired"); how to move the if(if($obj1!=$obj2)) statement to LHS? am not able to use this operator in version 3.0.6 Thanks and Regs. Basha