Hi, I have this case in my rules: rule "teste ID menor que zero ou null " dialect "mvel" #activation-group "grupo1" when C100($id : id < 0 || id == null) then System.out.println("O valor de id eh: " + $id); end This kind of expression "($id : id < 0 || id == null)" works fine using drools 4.0.7, but when i tried to update my project to use drools 5.0.1, it breaks. As it seems, the second part of the OR statement "id == null" overwrites the first part "id < 0", making my tests fail. I know the alternatives to solve this expression, but i would need to search and change more than 1500 legacy rules in my project. Do you guys have any kind of information about this?? Regards, Henrique