| Composite data element specification | C823 |
| Directory | Messages | Segments | Composites | Data elements | Codes | Meaning of the change indicators |
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| To identify the type of unit/component of an object (e.g. lock, door, tyre). |
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| 010 | 7505 | Unit or component type description code | C | 1 | an..3 | ||
| 020 | 1131 | Code list identification code | C | 1 | an..17 | ||
| 030 | 3055 | Code list responsible agency code | C | 1 | an..3 | ||
| 040 | 7504 | Unit or component type description | C | 1 | an..35 | ||
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