53Moreover, when issuing the E 101 certificate pursuant to Article 11a, the competent institution of a Member State does no more than state that the self-employed person concerned remains subject to the legislation of that Member State throughout a given period in the course of which he carries out a work assignment in the territory of another Member State. Although it should preferably be made before the beginning of the period concerned, such a statement may also be made during that period or indeed after its expiry.
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