Certificate of origin requirements updated: stricter issuance, validity, presentation and verification rules for preferential tariff claims. Amendment requires products claiming preferential concessions under the Asia Pacific Trade Agreement to be supported by a prescribed Certificate of Origin issued by a designated Issuing Authority. The annex sets formal certificate requirements (format, unique reference, issuance timing, validity, anti tampering and regional content disclosure), rules for submission to Customs including late acceptance in specified circumstances, documentation for transit through non Participating territories, procedures for change of destination and exhibition sales, and a structured origin verification process including verification requests, timelines, possible suspension of preferential treatment and consultation procedures.