I have a scenario like below Rule a When ! ( MyObject(aaa == “bbb”) && MyObject2(bbb == “aaa”) ) Then // do smth End I’m looking for an operator to reverse the evaluation result of the expression in the brackets. Is this possible -- View this message in context: http://drools.46999.n3.nabble.com/Is-there-a-logical-not-available-tp4017... Sent from the Drools: User forum mailing list archive at Nabble.com.