Question Yone Moreno Jimenez · Nov 20 Optimizing HL7 Routing Rules: Filtering ADT_A08 Messages Without OBXs Hello, First of all thanks for your time reading this doubt. We have discovered the following behaviour. Inside a Router we have a roule which needs to filter out the ADT_A08 messages which have not OBXs. The legacy system had this rule implemented: (((Document.{OBX(1).SetIDOBX}<"1")||((Document.{EVN:EventReasonCode}!="COD")&&(Document.{EVN:EventReasonCode}!="FIN"))) However we have tested it and it does not filter out the ADT_A08 messages. #Code Snippet #CSP #HealthShare 0 5 0 93