54As regards the admissibility of the arguments and evidence submitted in support of the parts of the single grounds of appeal under consideration – that admissibility being contested by the Commission on the ground that the arguments advanced in support of the appellants’ claims concerning the determination of the reference framework are new arguments – it should be borne in mind that, under Article 170(1) of the Rules of Procedure of the Court of Justice, the subject matter of the proceedings before the General Court may not be changed in the appeal.
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