decis februari interpret articl regul eec relat aggreg insur period period treat purpos invalid ag death administr commiss european commun social secur migrant worker regard articl regul eec made respons deal question interpret aris provis regul eec no decis publish offici journal european commun februari render unvalid entri forc regul eec no take account provis regul ground adopt decis extent insur period complet member state consider accord articl regul eec institut member state period amount twelv month minimum insur period requir legisl state period complet satisfi period complet state virtu provis articl regul eec exempt regul appli entitl benefit acquir virtu legisl person concern insur twelv month base period complet legisl deliber light condit laid articl regul eec decid insur period complet member state amount total twelv month minimum insur period requir legisl state award benefit satisfi period complet state question period consider member state person concern insur purpos acquisit retent recoveri entitl benefit calcul amount theoret pension pro rata part decis publish offici journal european commun appli octob founder member state accord treati access april member state presid administr commiss doni