HYN
Hierarchy information. EDIFACT segment whose function is to identify a hierarchical relationship between segments.
Definition
The HYN segment (Hierarchy information) is listed in the UN/CEFACT Trade Data Element and Segment Directory (TRSD). Its purpose: identify a hierarchical relationship between segments.
Origin
Published by UN/CEFACT in successive EDIFACT directories (D.96A and onward). The segment is defined by UN/TRSD and instantiated in the MIGs of messages that use it. Syntactic control is governed by ISO 9735.
Use
The HYN segment appears in transport messages to describe the parent/child link between two equipment lines. Like every EDIFACT segment, it is composed of simple or composite data elements qualified by UNCLs (United Nations Code Lists).