The API specifications for rate date ranges endpoints have been updated to clarify how derived rates inherit date ranges from master rates.

• GET /rates/{id}/date_ranges and GET /rates/{id}/date_ranges/{date_range_id} – for derived rates, returns the date ranges inherited from the parent master rate rather than rate-specific ranges
• POST /rates/{id}/date_ranges – only available for master rates; derived rates cannot have date ranges created independently
• PUT /rates/{id}/date_ranges/{date_range_id} – only available for master rates; changes automatically cascade to all derived rates