| Segment specification | BAS |
| Directory | Messages | Segments | Composites | Data elements | Codes | Meaning of the change indicators |
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| To describe the foundation or starting point. |
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| 010 |
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9045 | Basis code qualifier | M | 1 | an..3 | |||||||||
| 020 |
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C974 | Basis type | M | 1 | |||||||||
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C | 1 | an..3 | |||||||||
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C | 1 | an..17 | |||||||||
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C | 1 | an..3 | |||||||||
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C | 1 | an..35 |
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