I ran into a similar issue a while ago and had to rewrite the rule on how it deals with collection object as facts. Maybe, if you post your rule, I can try to suggest. -- View this message in context: http://drools.46999.n3.nabble.com/rules-users-drools-migration-tp4024691p4024716.html Sent from the Drools: User forum mailing list archive at Nabble.com.