(14)A Member State, none of the inland waterways of which are linked to the navigable network of another Member State, that decides not to issue Union certificates of qualification in accordance with this Directive, would be under a disproportionate and unnecessary obligation if it had to transpose and implement all the provisions of this Directive. Such a Member State should therefore be exempt from the obligation to transpose and implement the provisions related to the certification of qualifications for as long as it decides not to issue Union certificates of qualification. Such a Member State should nevertheless be required to recognise the Union certificate of qualifications on its territory in order to promote the mobility of workers within the Union, to decrease the administrative burden associated with labour mobility and to increase the attractiveness of the profession.