This rule: *rule* "Not" *when* *not*( RuleTime() Patient() ) *then* System.out.println("not"); *end* produces the following errors when compiled: [ERR 102] Line 43:5 mismatched input 'Patient' expecting ')' in rule "Not" [ERR 102] Line 44:5 mismatched input ')' expecting 'then' in rule "Not" But if I change it to use explicit ANDs instead of implicit ANDs it compiles and runs. *rule* "NotBlock" *when* *not*( RuleTime() *and* Patient() ) *then* System.out.println("notBlock"); *end* Is it invalid syntax to use implicit ANDs in a not block? If so, why? Thank You, Nathan Bell _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users