( c) the reasons which have led to the decision . the relevant Community rules in order to qualify for generalized tariff preferences .3. Where a decision on classification results in a change ofclassification practice or a change of category of any productsubject to the present Agreement , the competent authorities Article 3of the Community shall provide 30 days' notice, from thedate of the Community's communication , before the decisionenters into effect. Products shipped before the date of entry The certificate of origin shall be issued only on applicationinto effect of the decision shall remain subject to the earlier having been made in writing by the exporter or, under theclassification practice , provided that the goods in question exporter's responsibility , by his authorized representative .are presented for importation into the Community within The competent governmental authorities of the Republic of60 days of that date . Korea shall ensure that the certificate of origin is properly completed and for this purpose they shall call for any4. Where a Community decision on classification necessary documentary evidence or carry out any checkresulting in a change of classification practice or a change of which they consider appropriate .categorization of any product subject to the presentAgreement affects a category subject to restraint , theCommunity undertakes to enter into consultations withoutdelay in accordance with the procedures described in Article 4paragraph 1 of Article 16 of this Agreement with a view toagreeing necessary adjustments to the appropriate Where different criteria for determining origin are laid downquantitative limits established in Annex II and mitigating any for products falling within the same category , certificates ordisruptive effects which might arise from such a Community declarations of origin shall contain a sufficiently detaileddecision . description of the goods to enable the criterion to be determined on the basis of which the certificate was issued of the declaration drawn up .