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The main pdf documentation "MRN Data Models and Elektron Implementation Guide" does not mention this field at all. There is a discussion about the field in the N2_UBMS comparison page which is missing from the pdf documentation:
In MRN, the classification is defined in following JSON fields.
Hi @yushi.omote
It seems that the link to "MRN Data Models and Elektron Implementation Guide" was pointing to the old pdf.
We have fixed the link, please download the document again.