In the TD04 interface only one recipient is used, i.e. only 2 or 3 participants can be specified for a transmission. The attribute Alias="HPA" is used for the participant code. General Message definition Describes the contents of a message (metainfo and data) unique reference number identifying a single message Nachrichten-Referenz not used for TD04 Position of the unit as transmitted by the customer in the transport order unit segment. Unique number within the transport order. The position is used to unambigously identify the shipping unit in the communication. Position der Ladeeinheit im Transportauftrag. Eindeutige Nummer innerhalb des Transportauftrags. Die Positionsnummer wird in der Kommunikation benutzt zur eindeutigen Identifizierung der Ladeeinheit. according to HABIS code list A65 lt. SVZ A65