[rules-users] Drools ruturn multiple results based on child objects data length

Hi, In one-to-many relationship object type, Drools generate multiple results based on child objects data length. ie. No of child records belongs to parent object. I wanted the RHS part should be executed only if conditions imposed on child object satisfies. I have two facts with 1-* relationship defined in object mapping. class Invoice{} class Order{ private Set<Invoice> invoices; } *I wanted RHS should be executed with only one result irrespective of child records length.* rule "Multiple results set" when order: Order() invoice : Invoice() from order.invoices then System.out.println("Rule Example (Multiple results set)"+order.getId()); end; Result: Rule Example (Multiple results set)1000 Rule Example (Multiple results set)1000 Please help me in resolving this issue. Regards, Riyaz