I have attached my program project with my main FusionMain.java and two small classes and my rule file Sample.drl. It's a zip file i have modified to be .piz for mail server reasons. In the Main I set up and run as STREAM mode session and execute on a background thread .fireUntilHalt(). Then I inject two objects(DataReading and ConfigEvent) The Sample.drl rule has the rules: declare DataReading @role( event ) end declare ConfigEvent @role( event ) end rule "Detect high data reading" when $dr: DataReading(reading > 10.0) from entry-point "My Stream" then System.err.println("Data reading > 10"); end rule "Wait for follup config" lock-on-active when $dr: DataReading(reading > 10.0) from entry-point "My Stream" not($de: ConfigEvent(this after[0s,10s] $dr)) then System.err.println("Action"); end rule "Detect config event" when $ce: ConfigEvent() from entry-point "My Stream" then System.err.println("Config Event"); end What I expect is that I would see the DataReading rule fire right away(it does) then 5 seconds later when I insert the ConfigEvent I would see it's rule fire(it does) But the "Wait for follup config" rule fires no matter what. To me, that rule should wait and make sure no ConfigEvent object was inserted within 10 seconds after the DataReading object, but no matter what that rule fires after 10 seconds. How can I make my inserted ConfigEvent(inserted within the 10 seconds) satisfy that condition so it cancels that rule from firing? I am using the latest download from the site (5.2.0 final) binaries. Does Fusion in fact work or am I doing something wrong? The zip file has the entire runnable program and project(have to modify lib references to point to correct Drools 5.2 binaries). If the zip file does not come through I will attach the files individually next. Thanks, Chris