(ii) the purchase of, cost of, value of, and payment for, all materials, including indirect materials, used in the production of the good that is exported from its territory, and
(iii) the production of the good in the form in which the good is exported from its territory; and
(b) an importer claiming preferential tariff treatment for a good imported into the Party's territory shall maintain in that territory, for a period of five years from the date of importation of the good or for such longer period as the Party may specify, a copy of the Certificate and all other required documentation relating to the importation of the good.
Article 506: Origin Verifications
1. For purposes of determining whether a good imported into its territory from the territory of another Party qualifies as an originating good, a Party may, through its customs administration, conduct a verification solely by means of:
(a) written questionnaires to an exporter or a producer in the territory of another Party;
(b) visits to the premises of an exporter or a producer in the territory of another Party to review the records and observe the facilities used in the production of the good; or
(c) such other procedure as the Parties may agree.
2. Prior to conducting a verification visit pursuant to paragraph (1)(b), a Party shall, through its customs administration:
(a) deliver a written notification of its intention to
conduct such visit;