16Nevertheless, that principle is stated to be ‘subject to the provisions of Articles 14 to 17’ of Regulation No 1408/71. In certain specific situations the unrestricted application of the rule set out in Article 13(2)(a) of that regulation might in fact create, instead of prevent, administrative complications for workers as well as for employers and social security authorities, which would place obstacles in the way of the freedom of movement of the persons covered by that regulation (judgment of 4 October 2012, Format Urządzenia i Montaże Przemysłowe, C‑115/11, EU:C:2012:606, paragraph 31).
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