Definition of UN/EDIFACT - GS1

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The structure chart should always be read from top down and left to right (please note that themessage detailed is simply an example message and does not bear any relevance to realEANCOM messages).A message branching diagram is a pictorial representation (in flow chart style) which presentsthe logical sequence and relationships contained within a message.Branching diagrams should be read, starting at the UNH segment, from left to right and top tobottom. The lines contained within a branching diagram should be considered as guideswhich must be followed in order to progress through the message.Interchange structure and service segmentsThe interchange structure in an EDIFACT transmission is organised in several groupinglevels. The service segments are the envelope of the groups.
The first service segment possible in an interchange is the ‘UNA’ segment which is used todefine the separators being used in the interchange.The second service segment, "UNB", indicates the beginning of the interchange.The next one, "UNG", indicates the beginning of a group of messages of the same type, forexample invoices.The last service segment, "UNH", indicates the beginning of a given message.To each beginning service segment corresponds an ending service segment (note, UNA isnot a beginning segment).Service string advice:Interchange envelope:Group envelope:Message envelope:UNAUNB .... UNZUNG .... UNEUNH .... UNTThe interchange can thus be represented like this:Segment UNA is dependent on the character set being used. If the EANCOM defaultcharacter set A is being used then the UNA segment is not required.Segments UNB..UNZ and UNH..UNT are mandatory.Segments UNG..UNE are conditional. Within EANCOM the use of the UNG..UNE segmentsis not recommended as the grouping of same message types is not considered to addsignificant value to simply including multiple same message types within one interchange, i.e.between UNB..UNZ.If the UNG..UNE segments are used then it should be noted that it is not possible in theEANCOM CONTRL message to syntactically report on a functional group.The message itself is structured with a Header, a Detail and a Summary section. In messageswhere there may be ambiguity between the sections the UNS segment may be used as aseparator.The layout of the service segments UNA, UNB..UNZ, and UNG..UNE is presented in thissection.The segments UNH, UNS, and UNT being different for each message, are detailed in themessage description part of this manual.
Page 2 and 3: Definition of UN/EDIFACTUN/EDIFACT:
Page 4: Some segments may be repeated a cer
Page 15 and 16: EANCOM PART ISegment Layout- UNA se
Page 17 and 18: Segment Layout- UNB segmentUNB - M1
Page 19 and 20: DE 0001: The recommended (default)
Page 21: Segment Layout- UNZ segmentUNZ - M1

Definition of UN/EDIFACT - GS1

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