decis eec andorra joint committe decemb amend amount express ecu refer articl appendix definit origin product method administr cooper eec joint committe regard agreement form exchang letter european econom commun princip andorra articl thereof account currenc movement amend amount express ecu refer articl appendix definit origin product method administr cooper decid articl appendix definit origin product method administr cooper amend paragraph articl ecu replac ecu paragraph articl ecu replac ecu paragraph articl ecu replac ecu articl decis appli effect juli andorra la vella decemb joint committe jaum bartumeu cassani chairman