1. Notwithstanding the provisions of Article 1 of the basic Regulation, there shall also be considered as products originating in Costa Rica, El Salvador, Guatemala, Honduras or Nicaragua (hereinafter referred to as CACM countries) those products which have in accordance with those provisions acquired in one of those countries the status of originating products and which after being exported from that country have undergone no working or processing in any other CACM country or have not undergone sufficient working or processing in any such other country to confer on them by virtue of the said provisions the status of products originating in that other country, provided that:
(a) only products originating in a CACM country have been used in the course of such working or processing;
(b) where a percentage rule limits, in Lists A and B referred to in Article 3 of the Regulation referred to above, the proportion in value of non-originating products that can be incorporated under certain circumstances, the added value has been acquired in each of the countries in accordance with the said percentage rule and with the other rules contained in the said lists without any possibility of cumulation from one country to another.
2. For the purposes of paragraph 1 (a), the fact that products other than those referred to therein have been used in proportion not exceeding in total value 5 % of the value of the products obtained and imported into the Community shall not affect the determination of origin of the latter products, provided that the products so used would not have caused such latter products to lose the status of products originating in the CACM country from which they were first exported, had the products used been incorporated in that first country.
3. In the cases referred to in paragraph 1 (b) no non-originating product may be incorporated if it undergoes only working or processing as specified in Article 3 (2) of the basic Regulation.
4. Notwithstanding the provisions of paragraph 1 and provided that all the conditions laid down in that paragraph are nevertheless fulfilled, the products obtained shall not continue to be considered as products originating in the first CACM country of exportation unless the value of the products worked or processed in that country represents the highest percentage of the value of the products obtained. If this is not so, the latter products shall be considered as originating in the CACM country where the added value acquired represents the highest percentage of their value.