Investment arbitration under investment treaties between EU member states is a hot topic, in particular given the EU Commission’s strong views on the subject: The Commission has intervened in arbitrations in support of the position that the arbitral tribunal lacked jurisdiction to hear the dispute. One such matter was Eureko v. Slovakia, apparently the first case where this issue was brought before a state court, when Slovakia challenged an interim award confirming the jurisdiction of the tribunal in the Frankfurt Court of Appeals (Oberlandesgericht). The Frankfurt court in May 2012 upheld the award (see here and here for comments). The matter proceeded to the German Federal Supreme Court (Bundesgerichtshof) for judicial review (Rechtsbeschwerde). The Federal Supreme court published its order (Beschluss) dated September 19, 2013 on its website earlier this week.