Case C-428/17 P: Judgment of the Court (Ninth Chamber) of 14 March 2019 — Meta Group Srl v European Commission (Appeal — Arbitration clause — Grant agreements concluded in the context of the Sixth Framework Programme for Research, Technological Development and Demonstration Activities (2002-2006) — Grant agreements concluded in the context of the Competitiveness and Innovation Framework Programme (2007-2013) — Amounts allegedly owed by the European Commission in relation to the performance of those agreements — Outstanding balance of the total amount of the financial contribution granted to the appellant — Contractual liability)