Duty to communicate facts. 1. The bodies referred to in paragraph 2 of Article 12, in Article 8 and in Article 9 of the Supplementary Agreement shall, within their respective areas of jurisdiction, communicate to each other and to the persons concerned the facts and transmit the evidence necessary to secure the rights and obligations that follow from the legislation specified in paragraph 1 of Article 2 of the Supplementary Agreement and the Supplementary Agreement and this Arrangement.