28It should first be recalled that the Court has already ruled, first, that, in regard to social security, the purpose of the principle of application of the legislation of a single Member State is to avoid the complications which might ensue from the simultaneous application of a number of national legislative systems and, second, that the attachment of a worker to the legislation of the State where he resides, in a case where he pursues one or more self-employed activities in two or more Member States, is by no means unreasonable (see order in Vogler, paragraphs 26 and 27).
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