I doesn't even compile. As o2 did not come from the LHS, I get the follow error: The method setAttribute(boolean) is undefined for the type Object -- View this message in context: http://drools.46999.n3.nabble.com/rules-users-Bulk-modification-tp3297162p3297952.html Sent from the Drools: User forum mailing list archive at Nabble.com.