Hi, I have one more qurey on 'OR' logical operator for the following scenario: I want the the boolen result from parent object which satisfies two different condition sets with child objects. I made the rule which is generated duplicated results if both conditions are satisfied. rule "test" when order: Order ( exists ( condition-1 with child objects) or exists (condition-2 with child objects) ) then SOP("order id "+order.getId()); result : order id 1000 order id 1000 return the results in twice if both the conditions (cond-1 & cond-2) are satisfied. It just combine both results and behaves like 'union all' instead of 'union' function. Please provide me your suggestion on this. regards,riyaz