2. Each document shall bear a standardized serial Communities the names and addresses of the governmentalnumber , whether or not printed , by which it can be authorities competent for the issue and verification of exportidentified . licences , and certificates of origin together with specimens of the stamps used by these authorities . Pakistan shall alsoThis number shall be composed of the following elements : notify the Commission of any change in this information .— a number indicating the quota year,— numbers running from 00001 to 99999 allocated to the Article 20 country of destination ,— the numbering system shall also indicate the country of 1. Subsequent verification of certificates of origin or destination ( in box 7 of the export licence ), country of export licences shall be carried out at random , or whenever exportation and issuing office . the competent Community authorities have reasonable doubt as to the authenticity of the certificate or licence or as to the accuracy of the information regarding the products in question . Article IS 2. In such cases the competent authorities in theThe export licence and certificate of origin may be issued Community shall return the certificate of origin or exportafter the shipment of the products to which they relate . In licence or a copy thereof to the competent governmentalsuch cases they shall bear either the endorsement 'delivrée a authority in Pakistan giving , where appropriate , the reasons