[rules-users] Rule is firing on those objects for which that has already fired

Hi All, I am using Drools Stateful session with serialized Rule Base & Working memory for my application. I need to write some rule which will *only* fire on newly inserted data points in Working Memory. Does Drools support any such feature which will help me to achieve this ? Any suggestion, how can I achieve this efficiently? As sample, I have written a rule bellow: global RuleSetOutput ruleSetOutput rule "sample_rule" when (p4: DataObject(id == 4, stringValue == "230007014")) and (p14: DataObject(id == 14, stringValue == "230007004")) and (p10: DataObject(id == 10, stringValue == "230007005")) and (p11: DataObject(id == 11, stringValue == "230007006")) and (p12: DataObject(id == 12, stringValue == "230007007")) and (p13: DataObject(id == 13, stringValue == "230007008")) then String ruleID = "sample_rule"; RuleOutput ruleOutput = RuleEngineHelper.getRuleOutput(ruleSetOutput, ruleID); ruleOutput.addDataObject(p13); ruleOutput.addDataObject(p4); ruleOutput.addDataObject(p11); ruleOutput.addDataObject(p14); ruleOutput.addDataObject(p10); ruleOutput.addDataObject(p12); end For 1st execution, I am inserting 6 matching DataObjects into Working Memory. Rule is getting fired once & those 6 data points are getting added into RuleOutput. But in subsequent rule executions after I insert 6 more matching DataObjects into Working Memory, Rule is getting fired couple of times & objects from old executions also getting appended to the current RuleOutput. How can I avoid this ? Regards Siddhartha