An extension of the exception allowed by Article 55 to a whole profession would be possible only in cases where such activities were linked with that profession in such a way that freedom of establishment would result in imposing on the Member State concerned the obligation to allow the exercise, even occasionally, by non-nationals of functions appertaining to official authority.
A cet égard, il convient de constater que des conditions nationales de qualification, même appliquées sans discrimination tenant à la nationalité, peuvent avoir pour effet d'entraver l'exercice, par les ressortissants des autres Etats membres, du droit d'établissement qui leur est garanti par l'article 52 du traité.