Reference X12 Release 6030 Elements I67 Exchange Block Type Identifier Code 
I67  Exchange Block Type Identifier CodeCode identifying the type of interchange or exchange block content. For an interchange, this identifier is the name of the interchange control segment.
For an exchange block it is the filename extension if available, else it is user defined. Type Identifier (ID) Length Min 1 / Max 3 Stedi is a registered trademark of Stedi, Inc. Stedi's EDI Reference
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Stedi is a registered trademark of Stedi, Inc. Stedi's EDI Reference
      is provided for marketing purposes and is free of
      charge. All names, logos, and brands of third parties listed on our site
      are trademarks of their respective owners (including “X12”, which is a
      trademark of X12 Incorporated). Stedi, Inc. and its products and services
      are not endorsed by, sponsored by, or affiliated with these third parties.
      Our use of these names, logos, and brands is for identification purposes
      only, and does not imply any such endorsement, sponsorship, or
      affiliation.