A service segment starting and uniquely identifying a message. The message type code for the Application error and acknowledgement message is APERAK. Note: Application error and acknowledgement messages conforming to this document must contain the following data in segment UNH, composite S009: Data element 0065 APERAK D B UN
A segment to specify free form or processable supplementary information related to the whole message. In computer-to-computer exchanges free form text will normally require the receiver to process this segment manually.
A segment identifying the type of application error or acknowledgement within the referenced message. In case of an error, the error code may specify the error in detail (e.g. a measurement relating to a piece of equipment is wrong) or as a rough indication (e.g. a measurement is wrong).
A segment to provide explanation and/or supplementary information related to the specified application error or acknowledgement. For example, the explanation may provide exact details relating to a generic error code.