Opinion of the European Economic and Social Committee on the ‘Proposal for a Regulation of the European Parliament and of the Council amending the Convention implementing the Schengen Agreement of 14 June 1985 on the gradual abolition of checks at common borders as regards access to the Schengen Information System by the services in the Member States responsible for issuing registration certificates for vehicles’ (COM(2003) 510 final - 2003/0198 (COD))