I'm attaching a small standalone java program to demonstrate this. The code should be self explanatory. But in a nutshell, I'm feeding events into this rule: rule averageOverTime when $avg: Number() from accumulate ( MyEvent( key == 'someKey', $val : value ) over window:time( 200ms ), average( $val ) ) then System.out.println( "--- $avg in then clause is " + $avg ); end I set up a loop to feed events in and I do see the rule fire and my averages print out as I'd expect. I also set up a session listener to see if events are automatically expired/retracted. And they are. The trouble begins when I add this rule: rule RetractionBreaker when $a : MyEvent( key == 'A' ) MyEvent( key == 'B', this after $a ) then System.out.println( "--- just saw A followed by B" ); end Whether or not I inject events with key 'A' or 'B', no events of any kind are ever automatically retracted. Why is that? Thanks for helping me understand this!! - Ladd NoRetractionTest.java <http://drools.46999.n3.nabble.com/file/n4022716/NoRetractionTest.java> -- View this message in context: http://drools.46999.n3.nabble.com/Why-no-auto-retraction-after-adding-thi... Sent from the Drools: User forum mailing list archive at Nabble.com. _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users