Hi, thanks for your reply. It worked wih $r.getInstallations() in formula. :)
Now business rule looks like following : There is a RuleObject [$p] with: installations < 10 THEN 1. Set value of RuleObject [$p] calulatedValue =$p.getInstallations()*3 -- View this message in context: http://drools.46999.n3.nabble.com/Formula-error-in-Business-Rule-Guided-editor-tp3979546p3987687.html Sent from the Drools: User forum mailing list archive at Nabble.com. _______________________________________________ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users