| Composite data element specification | C506 |
| Directory | Messages | Segments | Composites | Data elements | Codes | Meaning of the change indicators |
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| Identification of a reference. |
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| 010 | 1153 | Reference code qualifier | M | 1 | an..3 | ||
| 020 | 1154 | Reference identifier | C | 1 | an..70 | ||
| 030 | 1156 | Document line identifier | C | 1 | an..6 | ||
| 040 | 4000 | Reference version identifier | C | 1 | an..35 | ||
| 050 | 1060 | Revision identifier | C | 1 | an..6 | ||
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