@laune, it is the same problem in version 6.0.0.Final. please try with that version if you have it already. Thanks -- View this message in context: http://drools.46999.n3.nabble.com/in-operator-breaking-the-Rete-Tree-tp4028148p4028188.html Sent from the Drools: User forum mailing list archive at Nabble.com.