Where, pursuant to the Treaties, the Council acts on a proposal from the Commission, it may amend that proposal only by acting unanimously, except in the cases referred to in paragraphs 10 and 13 of Article 294, in Articles 310, 312 and 314 and in the second paragraph of Article 315.

As long as the Council has not acted, the Commission may alter its proposal at any time during the procedures leading to the adoption of a Union act.