Hello, The rule below check which quote have a price above the average. In this form the rule is working, but from the log files it seems that this rule is doing a cross join. rule "above average value" dialect "mvel" when Double( $average : doubleValue) from accumulate( Quote( $price : value ), average( $price ) ) $quote : Quote(value > $average) then System.out.println("Quote above average [" + $quote.id + "] value [" + $quote.value + "] average [" + $average + "]") end I could not get the correct syntax. I would like to write something like: when Quote(value > doubleValue) from accumulate( Quote( $price : value ), average( $price ) ) Thanks, regards.