Case C-398/09: Judgment of the Court (Grand Chamber) of 6 September 2011 (reference for a preliminary ruling from the Østre Landsret (Denmark)) — Lady & Kid A/S, Direct Nyt ApS, A/S Harald Nyborg Isenkram- og Sportsforretning, KID-Holding A/S v Skatteministeriet (Refusal to reimburse a tax paid in error — Unjust enrichment arising from the link between the introduction of that tax and the abolition of other taxes)