Hi, I have OUL_R21 facts which have a array of OUL_R21_ORDER_OBSERVATION objects. OUL_R21_ORDER_OBSERVATION object has a array of OUL_R21_OBSERVATION. OUL_R21_OBSERVATION object has a array of OUL_R21_OBSERVATION_RESULT. And OUL_R21_OBSERVATION_RESULT has a OBX child. I want to add the number one in my global list if one of all OBX has abnormalFlags.value in ( 'HH', 'LL', 'AA', 'H', 'L', 'A' ) if (OUL_21.ORDER_OBSERVATIONS[*].OBSERVATIONS[*].OBSERVATION_RESULTS[*].OBX.abnormalFlags.value in ( 'HH', 'LL', 'AA', 'H', 'L', 'A' )) list.add(1); Here is the rule in tring to create... package com.xwave.drools import com.xwave.hapi.hl7v2.model.v24.message.OUL_R21 import com.xwave.hapi.hl7v2.model.v24.group.OUL_R21_ORDER_OBSERVATION import com.xwave.hapi.hl7v2.model.v24.group.OUL_R21_OBSERVATION import com.xwave.hapi.hl7v2.model.v24.group.OUL_R21_OBSERVATION_RESULT import java.util.ArrayList import ca.uhn.hl7v2.model.v24.segment.OBX global java.util.List list /* Pour le chainage de tableau, il est obligatoire de le faire étape après étape */ rule "Get All OBX" dialect "mvel" when $labMessage : OUL_R21() $orderObservation : OUL_R21_ORDER_OBSERVATION() from $labMessage.ORDER_OBSERVATIONS $observation : OUL_R21_OBSERVATION() from $orderObservation.OBSERVATIONS $observationResult : OUL_R21_OBSERVATION_RESULT() from $observation.OBSERVATION_RESULTS $obx : OBX() from $observationResult.OBX then insert($obx); end rule "Abnormals" dialect "mvel" when $result : ArrayList(size > 0) from collect(OBX(abnormalFlags.value in ( 'HH', 'LL', 'AA', 'H', 'L', 'A' ))) then System.out.println("Abnormal result : " + $result); list.add(1); end Could you please tell me the solution. -- View this message in context: http://drools-java-rules-engine.46999.n3.nabble.com/Rules-if-one-of-eleme... Sent from the Drools - User mailing list archive at Nabble.com.