Hi I have such problem. I use Guvnor as a storage for rules, and now i want to add calendars declaration to some rule. I've done this and in my sources of these rules i can see: rule "CalendarTest" calendars "AUD Home Loans" no-loop true dialect "mvel" when then System.out.println("CALENDAR IS WORKING!!!"); end In my application I use KnowledgeAgent and such configuration to use rules from Guvnor: KnowledgeBuilder builder = KnowledgeBuilderFactory .newKnowledgeBuilder(); builder.add(ResourceFactory.newClassPathResource("ChangeSet.xml"), ResourceType.CHANGE_SET); if (builder.hasErrors()) { throw new RuntimeException(builder.getErrors().toString()); } // creating KnowledgeBase and Session KnowledgeBase base = KnowledgeBaseFactory.newKnowledgeBase(); base.addKnowledgePackages(builder.getKnowledgePackages()); StatefulKnowledgeSession session = base.newStatefulKnowledgeSession(); my ChangeSet.xml looks like this: <change-set xmlns='http://drools.org/drools-5.0/change-set' xmlns:xs='http://www.w3.org/2001/XMLSchema-instance' xs:schemaLocation='http://drools.org/drools-5.0/change-set http://anonsvn.jboss.org/repos/labs/labs/jbossrules/trunk/drools-api/src/... <add <resource source=' http://localhost:8083/drools-guvnor/rest/packages/magick-model/source' type='DRL' basicAuthentication="enabled" username="admin" password="admin"/ </add</change-set But the problem is when i invoke fureRules this rule with calendars clause also invokes, even if i don't set any calendar objects to session. Can you help me what the problem is? And if i just use local drl file, everything works fine Thanks, Anton