Case C-31/21, Eurocostruzioni: Judgment of the Court (First Chamber) of 2 March 2023 (request for a preliminary ruling from the Corte suprema di cassazione — Italy) — Eurocostruzioni Srl v Regione Calabria (Reference for a preliminary ruling — Structural Funds — Regulation (EC) No 1685/2000 — Eligibility of expenditure — Requirement of proof of payment — Receipted invoices — Accounting documents of equivalent probative value — Construction undertaken directly by the final beneficiary)