In Fundação Patrimônio Histórico da Energia e Saneamento v Corumbataí Eletricidade Ltda., Special Appeal n. 1.465.535-SP, the Superior Court of Justice (STJ) considered whether arbitral tribunals have jurisdiction to hear motions filed by a debtor seeking to stay proceedings for contractual enforcement, where the dispute relates to the validity, effectiveness or scope of the instrument containing the arbitration clause.