'Demonstrable error' under s 327(3)(d) of the Workplace Injury Management and Workers Compensation Act 1998 means an error readily apparent from examination of the medical assessment certificate and the referral document. An implicit or unstated agreement between the parties as to the nature and extent of injury does not restrict the AMS's inquiry and does not constitute demonstrable error. Parties wishing to restrict the scope of an AMS's assessment must ensure that express findings are made by the arbitrator or that agreements are recorded in the referral document.
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