87As regards the plea of inadmissibility raised by the Republic of Poland, it should be noted that, in accordance with settled case-law, the subject-matter of an action under Article 258 TFEU for failure to fulfil obligations is determined by the Commission’s reasoned opinion, so that the action must be based on the same grounds and pleas as that opinion (Case C-171/08 Commission v Portugal, paragraph 25 and case-law cited).
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