Certificate of origin required to claim preferential tariff treatment; issuance, verification and denial rules govern origin determinations. Certificates of origin, issued in English by the exporting Party's competent governmental authority or its designees, are the primary document required to claim preferential tariff treatment; they must follow the prescribed format with six digit HS codes, a unique certification number, exporter's declaration and supporting proof that the good qualifies as originating. Issuance, retroactive issuance, record keeping, specimen signatures, and notification obligations are regulated, and importing customs may request origin information, suspend preference during verification, conduct on site visits, and deny preferential treatment if information is insufficient or not provided.