39In particular, in order to prevent an undertaking established in a Member State from being obliged to register its workers, normally subject to the social security legislation of that State, with the social security system of another Member State where they are sent to perform work of short duration — which would complicate exercise of freedom to provide services — Article 12(1) of Regulation No 883/2004 allows the undertaking to keep its workers registered under the social security system of the first Member State if the undertaking observes the conditions governing that freedom to provide services (see, by analogy, judgment of 10 February 2000, FTS, C‑202/97, EU:C:2000:75, paragraph 29 and the case-law cited).
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