35It should be remembered that EU law does not detract from the power of the Member States to organise their social security systems and that, in the absence of harmonisation at EU level, it is for the legislation of each Member State to determine the conditions for the grant of social security benefits. Nevertheless, the Member States must comply with EU law when exercising that power (judgment in Melchior, C‑647/13, EU:C:2015:54, paragraph 21 and the case-law cited therein), which includes the principles identified by the Court in its case-law relating to the interpretation of the principle of sincere cooperation in conjunction with the Staff Regulations.
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