(i) its knowledge of whether the good qualifies as an originating good,
(ii) reasonable reliance upon the producer's written
representation that the good qualifies as an
originating good, or
(iii) a completed and signed Certificate for the
good voluntarily provided to the exporter by
the producer.
4. Nothing in paragraph 3 shall be construed to require a producer to provide a Certificate of Origin to an exporter.
5. Each Party shall:
(a) provide that a Certificate of Origin that has been completed and signed by an exporter or a producer in the territory of another Party that is applicable to
(i) a single importation of a good into its territory, or
(ii) multiple importations of identical goods imported into its territory within any specified period, not exceeding 12 months, set out therein by the exporter or producer,
shall be accepted by its customs administration for a period of four years after the date on which the Certificate was signed; and
(b) require an exporter or a producer in its territory that completes and signs a Certificate pursuant to subparagraph (a) to notify in writing all persons to whom such Certificate was given of any change that could affect its accuracy or validity.