70Correspondingly, failure to implement the procedure established in Article 84a(3) of Regulation No 1408/71 would be such as to increase the risk of subjecting the workers concerned to the social security systems of a number of Member States, with all the complications that such overlapping would be likely to entail, which would undermine the rule, in accordance with the principle that the national legislation of only one Member State should be applicable, that workers should be affiliated to one single social security system, and would adversely affect the foreseeability of which system was applicable and, therefore, legal certainty (see, to that effect, judgment of 26 January 2006, Herbosch Kiere, C‑2/05, EU:C:2006:69, paragraph 25).
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