Given the following rule replicated for enums EDay.SUNDAY through EDay.THURSDAY and a single DummyTester fact starting with EDay.SUNDAY. rule "Sunday" when $dt: DummyTester(EDay.SUNDAY == day) then System.out.println("RULE: entered rule: "+drools.getRule().getName()); modify ($dt) {setDay(EDay.MONDAY)}; end On 5.1.1 and using HEAD: RULE: entered rule: Sunday RULE: entered rule: Monday RULE: entered rule: Tuesday RULE: entered rule: Wednsday RULE: entered rule: Thursday On 5.2 RULE: entered rule: Thursday RULE: entered rule: Wednsday Who knows how this was fixed? Regards -W _______________________________________________ rules-dev mailing list rules-dev(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-dev