Article 1 the relevant rules in force in the Community.1. The competent authorities of the Community 3. However , the products in group III may be importedundertake to inform the USSR of any changes in the into the Community in accordance with the arrangementscombined nomenclature ( CN) before the date of their entry established by this Agreement on production of a declarationinto effect in the Community. by the exporter on the invoice or other commercial document2. The competent authorities of the Community relating to the products to the effect that the products inundertake to inform the USSR of any decisions relating question originate in the USSR within the meaning of the relevant rules in force in the Community.to the classification of products subject to the Agreementwithin one month of their adoption at the latest. Suchcommunication shall include : Article 3( a ) a description of the products concerned ; The certificate of origin shall be issued only on application(b ) the relevant category and the related CN codes; having been made in writing by the exporter or, under the(c) the reasons which have led to the decision . exporter's responsibility, by his authorized representative . The competent USSR organizations authorized under USSR3. Where a decision on classification results in a change of legislation shall ensure that the certificate of origin isclassification practice or a change of category of any product properly completed and for this purpose they shall call forsubject to the Agreement, the competent authorities of the any necessary documentary evidence or carry out any checkCommunity shall provide 30 days' notice, from the date of which they consider appropriate .the Community's communication , before the decision is putinto effect . Products shipped before the date of entry intoeffect of the decision shall remain subject to the earlier Article 4classification practice, provided that the goods in questionare presented for importation into the Community within 60 Where different criteria for determining origin are laid down