IMPDEF EDI implementation guide definition message (D12A)

This is the standard EDIFACT D12A spec, with 13 loops and 41 segment positions, as OpenEDI JSON, an ediFabric C# template and an ediFabric Native model. To change it for a trading partner, customize it in the EDI Spec Builder.

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The spec as an OpenAPI 3 schema with x-openedi-* extensions, for ediFabric Native, ediFabric Cloud and the EDI Spec Builder. Download OpenEDI (70 KB) Generate classes

The ediFabric .NET template, class TSIMPDEF. It needs the common segments, composites and codes of EDIFACT D12A, one download for every transaction in the version. Download C# (1 KB) Common files (68 KB)

The intermediary model ediFabric Native loads with set_map. Native supports X12 today, and EDIFACT is coming. Download Native (1 KB)

Use the IMPDEF spec in your code

ediFabric .NET

Add the C# template and its common files to your project, or reference the template NuGet package, and read IMPDEF files into TSIMPDEF objects. See ediFabric .NET.

ediFabric Native

Native supports X12 today, and EDIFACT is coming. When it's available, map version D12A to this Native model with set_map to parse IMPDEF files to JSON from Python, Java, C or C#. See ediFabric Native.

OpenEDI

Select Customize in Spec Builder to copy the spec under your own name, change it for your partner, and parse files against it in EdiNation, ediFabric Native or ediFabric Cloud. Read about OpenEDI.

Generate IMPDEF classes in Python, Java, Node.js, Go, Rust or C

The OpenEDI file describes each IMPDEF as JSON. To work with IMPDEF data as typed objects, generate classes from the OpenEDI file in your language; the root class is TSIMPDEF. The classes keep the loops, segments, lengths and code lists, but not the EDI data formats. Read more in Generate a class from OpenEDI.

Python: datamodel-code-generator. Node.js: openapi-typescript. Java, Go, Rust and C: OpenAPI Generator.

IMPDEF structure

Loops and segments of the standard IMPDEF, with their usage and maximum repeats.

ID	Name	Usage	Max use
UNH	UNH	Mandatory	1
BGM	BGM	Mandatory	1
MSG	MSG	Mandatory	1
RCS	RCS	Optional	1
DII	DII	Mandatory	1
RFF	RFF	Optional	99
DTM	DTM	Optional	9
FTX	FTX	Optional	999
Loop PNA	PNA	Optional	5
PNA	PNA	Mandatory	1
ADR	ADR	Optional	1
Loop CTA	CTA	Optional	9999
CTA	CTA	Mandatory	1
COM	COM	Optional	5
Loop DFN	DFN	Optional	99999
DFN	DFN	Mandatory	1
FTX	FTX	Optional	99
Loop GRU	GRU	Optional	1
GRU	GRU	Mandatory	1
FTX	FTX	Optional	99
Loop SGU	SGU	Optional	999
SGU	SGU	Mandatory	1
FTX	FTX	Optional	99
Loop FNT	FNT	Optional	99
FNT	FNT	Mandatory	1
REL	REL	Optional	1
GIR	GIR	Optional	9
FTX	FTX	Optional	99
Loop RFF	RFF	Optional	99
RFF	RFF	Mandatory	1
FTX	FTX	Optional	99
Loop ELU	ELU	Optional	99
ELU	ELU	Mandatory	1
ELM	ELM	Optional	1
EDT	EDT	Optional	1
IMD	IMD	Optional	9
GEI	GEI	Optional	9
FTX	FTX	Optional	99
Loop MEA	MEA	Optional	999
MEA	MEA	Mandatory	1
FTX	FTX	Optional	99
Loop ELV	ELV	Optional	99999
ELV	ELV	Mandatory	1
FTX	FTX	Optional	99
Loop CDV	CDV	Optional	99999
CDV	CDV	Mandatory	1
FTX	FTX	Optional	99
Loop DRD	DRD	Optional	99999
DRD	DRD	Mandatory	1
FTX	FTX	Optional	99
Loop AUT	AUT	Optional	1
AUT	AUT	Mandatory	1
DTM	DTM	Optional	1
UNT	UNT	Mandatory	1