Judgment of the Court (Ninth Chamber) of 2 May 2019.#Lavorgna Srl v Comune di Montelanico and Others.#Request for a preliminary ruling from the Tribunale Amministrativo Regionale per il Lazio.#Reference for a preliminary ruling — Public procurement — Directive 2014/24/EU — Labour costs — Automatic exclusion of tenderer where those costs were not listed separately in the tender — Principle of proportionality.#Case C-309/18.