| Data element specification | 0026 |
| Directory | Messages | Segments | Composites | Data elements | Codes | Meaning of the change indicators |
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| Identification of the application area assigned by the sender, to which the messages in the interchange relate e.g. the message identifier if all the messages in the interchange are of the same type. Notes: 1. Optionally message identification if the message interchange contains only one type of message. |
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