FetchXML Query with NOT-IN

If you want to get all available Resources of specific Resource Category that don’t have any booking for the particular period with FetchXML,  I tried NOT-IN clause and landed in following error, Microsoft.Crm.CrmException: Unknown Condition Operator: not- in at Microsoft.Crm.Platform.QuerySerializationUtil.ConditionOperatorFromString(String operatorText) But OUTER join worked for the scenario and it gave the correct result. With small…