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Sun B2B Suite ASC X12 OTD Library User's Guide

Steps Taken to Check for ISA Segment Errors

Assuming valid data, the logic for checking ISA segment errors is as follows:

  1. Check whether the character at index=3 is a valid element separator. If not, an UnmarshalException is thrown, and the unmarshaling process is terminated.

  2. Check whether the characters at index=6,17,20,31,34,50,53,69,76,81,83,89,99,101,103 is same as that at index=3. If not, an UnmarshalException is thrown with an error message that begins "ISA Segment Error", and processing continues with variable length parsing.

  3. Check whether the character at index=104 is a valid subelement separator. If not, an UnmarshalException is thrown with an error message that begins "ISA Segment Error", and processing continues with variable-length parsing.

  4. Check whether the character at index=105 is a valid segment terminator, and also verify that this character is different from the element separator and subelement separator. If not, an UnmarshalException is thrown with an error message that begins "ISA Segment Error", and processing continues with variable-length parsing .

  5. If the version of X12 is version 4020 or later, check whether the character at index=82 is a valid repetition separator and different from the element separator, subelement separator, and segment terminator. If not, an UnmarshalException is thrown with an error message that begins "ISA Segment Error", and processing continues with variable-length parsing .

  6. If variable-length parsing becomes necessary, the ISA segment is parsed using the element separator to retrieve the next sixteeen data elements. After this ISA parsing, an UnmarshalException is thrown with an error message that begins "ISA Segment Error", and the OTD with ISA segment parsed may be examined later to retrieve the parsed ISA segment.

If the message does not have a terminator for its last segment , the ISA segment is also parsed before an UnmarshalException is thrown. You can catch this UnmarshalException and examine the parsed ISA segment in the OTD, for example, to generate negative TA1 acknowledgment.