| Segment specification | CPS |
| Directory | Messages | Segments | Composites | Data elements | Codes | Meaning of the change indicators |
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| To identify the sequence in which physical packing is presented in the consignment, and optionally to identify the hierarchical relationship between packing layers. |
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| 010 |
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7164 | Hierarchical structure level identifier | M | 1 | an..35 | |||
| 020 |
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7166 | Hierarchical structure parent identifier | C | 1 | an..35 | |||
| 030 |
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7075 | Packaging level code | C | 1 | an..3 |
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