| Composite data element specification | C849 |
| Directory | Messages | Segments | Composites | Data elements | Codes | Meaning of the change indicators |
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| Identify the sending and receiving parties of the instruction. |
| 覧覧覧覧覧覧覧覧覧覧覧覧覧覧覧覧覧覧覧覧覧覧覧 |
| 010 | 3301 | Enacting party identifier | M | 1 | an..35 | ||
| 020 | 3285 | Instruction receiving party identifier | C | 1 | an..35 | ||
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