Basha If the problem is that it is retracting all your objects, then the engine is working fine. What changed from the 3.0.x branch to the milestone is that in 3.0.x branch, the same object would not match more than one pattern, while in the milestone, the default is now to allow the same object to match more than one pattern. So, for the rule to work as you want, you need to either set an option for the engine to work as it worked in 3.0.x or add a constraint to the rule. a) If you prefer to set the option, you may set the system property " drools.removeIdentities = true", or call the following method in the RuleBaseConfiguration: RuleBaseConfiguration.setRemoveIdentities(boolean removeIdentities); b) If you prefer to change your rule, you can do this: $provAddress:ProviderAddress( $addType : addressTypeCode, $pPI : primaryPracticeIndicator ) $provAdd:ProviderAddress( this != $provAddress, addressTypeCode == $addType, $pp:primaryPracticeIndicator == $pPI ) Regards, Edson 2007/3/29, Sikkandar Nawabjan <Sikkandar.Nawabjan(a)ustri.com&gt;: -- Edson Tirelli Software Engineer - JBoss Rules Core Developer Office: +55 11 3124-6000 Mobile: +55 11 9218-4151 JBoss, a division of Red Hat @ www.jboss.com

agenda-group http://labs.jboss.com/file-access/default/members/jbossrules/freezone/doc... activation-group http://labs.jboss.com/file-access/default/members/jbossrules/freezone/doc... agenda-groups are used to partition your rule execution, where as activation-groups are used to make sure only one rule out of a set of rules fires. Mark Sikkandar Nawabjan wrote: