I'm busy arguing that if the check digit is designed to allow multiple values as valid, and you only check whether you match one of those, don't blame me when the others get rejected.
That said, whoever designed a global system using modulo-97, but didn't factor in values could go to 97 or 98 needs shooting.
That said, whoever designed a global system using modulo-97, but didn't factor in values could go to 97 or 98 needs shooting.
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