Appendix 20 Reason Type Codes FOR Differences
ATO (CWLTH) resource. Rules Mate indexes this as part of the Australian compliance corpus. Click through for the regulator's primary source.
https://www.ato.gov.au/forms-and-instructions/international-dealings-schedule-2025-instructions/appendixes-for-the-ids/appendixes-11-to-20/appendix-20-reason-type-codes-for-differences
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