EDI X12 "ISA" header format

Question

Hi I have a question about the "ISA" header structure of EDI X12 message:

Does any one know whether the structure of "ISA" differs between different versions (e.g. 4010, 5010...)?

Thanks!

Answer 1

The structure of the ISA doesn't change - it is still a fixed length segment with 15 elements and 106 characters. The version (004010) is defined in the group (GS08). There is an element that defines the "interchange" version, but it does not affect the structure of the ISA segment.