156According to settled case-law, a claim for repayment based on unjust enrichment of the European Union requires, in order to succeed, proof of an enrichment on the part of the European Union for which there is no legal basis and of impoverishment on the part of the applicant which is linked to that enrichment (see judgment of 28 July 2011, Agrana Zucker, C‑309/10, EU:C:2011:531, paragraph 53 and the case-law cited).