Folks, I Started using 4.0.1, Regarding nested accessors, looks like they work, but they require to put "this" at the beginning. So rule when TestSupplier(testBusiness.statusActive == true) --> FAILS When TestSupplier(this.testBusiness.statusActive == true) --> OK! It fails with the following exception: org.drools.rule.InvalidRulePackage: Unable to determine the used declarations : [Rule name=HQ To Active From Probation. Mfg On Probation Exists., agendaGroup=MAIN, salience=10, no-loop=false] at org.drools.rule.Package.checkValidity(Package.java:419) Please confirm this to be a bug and then I will open JIRA for this, or please let me know the reason behind this functionality, Thanks, -Sergey ********************** ** LEGAL DISCLAIMER ** ********************** This E-mail message and any attachments may contain legally privileged, confidential or proprietary information. If you are not the intended recipient(s), or the employee or agent responsible for delivery of this message to the intended recipient(s), you are hereby notified that any dissemination, distribution or copying of this E-mail message is strictly prohibited. If you have received this message in error, please immediately notify the sender and delete this E-mail message from your computer.