Hi, I am new to drools The following collect statement is working i wanted group by hild References(id: hlid); $prds : Products(products!=null) $matchingrecords : List() from collect ( Product(hlId==id) from $prds.products ) when the list contains 1,1,2,2 it works when the list contains 1,1,2,1 the condition fails. I trying to group by hlId please help -- Raja Sekhar Amirapu ------------------------------------------------------ "If any anyone can do it, i can do it. If no one else can do it, i must do it"