| Directory | Messages | Segments | Composites | Data elements | Codes | Meaning of the change indicators |
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| Code and/or name of a contact such as a department or employee. Code preferred. |
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| 010 | 3413 | Contact identifier | C | 1 | an..17 | ||
| 020 | 3412 | Contact name | C | 1 | an..256 | ||
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