42Article 11(1) of Regulation No 883/2004 reaffirms the principle of a single applicable law, under which the persons to whom that regulation applies are subject to the legislation of a single Member State. Therefore, that principle aims to avoid the complications which may arise from the simultaneous application of several national forms of legislation and to eliminate unequal treatment, which, for persons moving within the Union, would be the consequence of partial or total overlapping of the applicable legislation (see, to that effect, judgment of 9 March 2006, Piatkowski, C‑493/04, EU:C:2006:167, paragraph 21).
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