| Segment | Ebene | Beschreibung | Opt/Mand. |
|---|
| UNH | 0 | 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 A UN | Mandatory |
| BGM | 0 | A segment to indicate the type and function of the message and to transmit the identifying number. | Mandatory |
| DTM | 0 | A segment to specify related date/time. | Optional |
| FTX | 0 | 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. | Optional |
| CNT | 0 | A segment to provide message control totals. | Optional |
| SG1 | 0 | SG1 | Optional |
| DOC | 1 | A segment to provide the necessary identification information about the document being acknowledged. | Mandatory |
| DTM | 1 | A segment to provide the relevant dates concerning the document being acknowledged. | Optional |
| SG2 | 0 | SG2 | Optional |
| RFF | 1 | A segment to indicate the reference number of the document/message. | Mandatory |
| DTM | 1 | A segment to specify the date and time of the referenced document/message. | Optional |
| SG3 | 0 | SG3 | Optional |
| NAD | 1 | A segment to specify the identification of the message issuer and message receiver. | Mandatory |
| CTA | 1 | A segment to specify a person or department inside the party's organization, to which communication should be directed. | Optional |
| COM | 1 | A segment to indicate communication channel type and number inside the party's organization, to which communication should be directed. | Optional |
| SG4 | 0 | SG4 | Optional |
| ERC | 1 | 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). | Mandatory |
| FTX | 1 | 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. | Optional |
| SG5 | 1 | SG5 | Optional |
| RFF | 2 | A segment to provide a reference relating to the acknowledgement type or the specified error (e.g. functional entity reference such as equipment level). | Mandatory |
| FTX | 2 | A segment to provide additional details relating to the reference, e.g. the content of the wrong data (and its exact place in the message). | Optional |
| UNT | 0 | A service segment ending a message, giving the total number of segments in the message (including the UNH & UNT) and the control reference number of the message. | Mandatory |
