Hi, I have a rule with an infixOr and an infixAnd that test for objects in a collection which doesn't execute even though it should. # This rule will not execute even though it should rule "FAIL_AorBandC" when test : TestClass( string=="TEST" ) ( TestClass( string == "A" ) from test.list or TestClass( string == "B" ) from test.list ) and TestClass( string == "C" ) from test.list then System.out.println( "FAIL_AorBandC: " + test.getString() ); end All other combinations of ANDs and ORs such as (A and B) or C, (A or B), (A or B) or C will work except the one above if a from collection is used. (A or B) and C will work if a from collection is not used. Has anyone come across this? Is this a bug? Thanks, Len