for products falling within the same category , certificates or (c) the reasons which have led to the decision . declarations of origin shall contain a sufficiently detailed description of the goods to enable the criterion to be 3. Where a decision on classification results in a change of determined on the basis of which the certificate was issued or classification practice or a change of category of any product the declaration drawn up . subject to the Agreement, the competent authorities of the Community shall provide 30 days' notice , from the date of the Community's communication , before the decision enters into effect. Products shipped before the date of entry into Article S effect of the decision shall remain subject to the earlier classification practice , provided that the goods in question The discovery of slight discrepancies between the statements are presented for importation into the Community within 60 made in the certificate of origin and those made in the days of that date . documents produced to the customs office for the purpose of carrying out the formalities for importing the product shall not ipso facto cast doubt upon the statements in the certificate . TITLE II ORIGIN TITLE III Article 2 DOUBLE CHECKING SYSTEM FOR CATEGORIES OF