| Directory | Messages | Segments | Composites | Data elements | Codes | Meaning of the change indicators |
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| To indicate the exact segment location of an application error within a message. |
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| 010 | 9166 | Segment tag identifier | C | 1 | an..3 | ||
| 020 | 1050 | Sequence position identifier | C | 1 | an..10 | ||
| 030 | 1159 | Sequence identifier source code | C | 1 | an..3 | ||
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