Electronic Data Interchange (ASC/X12)
Auto-Create Functional Group Response Header (AK1)

A Functional Group Response Header (AK1) is created immediately after the transaction set header.  Like the transaction set header, there is a one-to-one relationship of this segment with the functional group in the subject document.  There should be an equal number of AK1 in the implementation acknowledgement as there are Functional Group Header (GS) in the subject document.  The AK1 is created as follows:
POSITION ELEMENT ID DESCRIPTION CONSTRUCT INFO
01 479  Functional Identifier Code The functional group identifier of the referenced functional group is assigned here.
02 28  Group Control Number The control number of the referenced functional group is assigned here.
03 480  Version / Release / Industry Identifier Code The version/release information of the referenced functional group is assigned here.  The exact value found in data element 480 of the GS in the referenced functional group is assigned here.

 

The example below shows where the AK1 data segment populates its data from the GS data segment.

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