communication shall include : competent governmental authorities of Pakistan shall( a ) a description of the products concerned; continue to ensure that the certificate of origin is properly completed and for this purpose they shall call for any( b ) the relevant category, tariff position or sub-position and necessary documentary evidence or carry out any check the NIMEXE code ; which they consider appropriate .( c) the reasons which have led to the decision . Article 43. Where a decision on classification results in a change ofclassification practice or a change of category of any product Where different criteria for determining origin are laid downsubject to the present Agreement , the competent authorities for products falling within the same category , certificates orof the Community shall provide 30 days' notice , from the declarations of origin shall contain a sufficiently detaileddate of the Community's communication , before the decision description of the goods to enable the criterion to beenters into effect . Products shipped before the date of entry determined on the basis of which the certificate was issued orinto effect of the decision shall remain subject to the earlier the declaration drawn up .classification practice , provided that the goods in questionare presented for importation into the Community within 60days of that date . Article 5 The discovery of slight discrepancies between the statements made in the certificate of origin and those made in the