57In those circumstances, it is precisely in order to ensure that that symmetry is actually observed that the rule identified by the case-law of the Court — that it is the substantive legal basis of a measure that determines the procedures to be followed in adopting that measure (see Parliament v Council EU:C:2012:472, paragraph 80) — applies not only to the procedures laid down for adopting an internal act but also to those applicable to the conclusion of international agreements.
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