| Segment specification | ASI |
| Directory | Messages | Segments | Composites | Data elements | Codes | Meaning of the change indicators |
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| To identify the structure of an array. |
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| 010 |
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C779 | Array structure identification | M | 1 | |||||||||
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M | 1 | an..35 | |||||||||
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C | 1 | an..3 | |||||||||
| 020 |
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C082 | Party identification details | C | 1 | |||||||||
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M | 1 | an..35 | |||||||||
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C | 1 | an..17 | |||||||||
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C | 1 | an..3 | |||||||||
| 030 |
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4405 | Status description code | C | 1 | an..3 | |||||||||
| 040 |
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4513 | Maintenance operation code | C | 1 | an..3 |
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