Error Code 1106: Interchange **Invalid ISA11**

Modified on Thu, Sep 11, 2025 at 11:57 AM

The ISA11, called the Repetition Separator, indicates how repeated elements in a segment are separated in versions 00403 and above. In older versions, it was used as a component element separator. The repetition separator must be a valid ASCII character.

  • When troubleshooting the ISA11, consider the following:
  • The ISA11 must be different than the ISA16 (element separator)
  • The ISA11 must be different than the ISA18 (segment terminator)
  • Characters in the ISA11 must not be a non-printable or control character
  • The ISA11 is a fixed 1 character length and should not be more or less than 1 character
  • Some trading partners may expect or require a specific character for the ISA11


Recommended Action: Review the ISA11 element in your ISA segment. 

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