30Second, it is important to recall that, in the context of the cooperation established by Article 267 TFEU, it is for the national courts to determine whether the taxable person makes a single supply in a particular case and to make all definitive findings of fact in that regard. However, it is for the Court to provide the national courts with all the guidance as to the interpretation of European Union law which may be of assistance in adjudicating on the case pending before them (judgment of 17 January 2013, BGŻ Leasing, C‑224/11, EU:C:2013:15, paragraph 33 and the case-law cited).
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