Article 21 12

12.   Where the regulatory authorities concerned cannot reach an agreement as referred to in paragraph 4 of this Article, ACER shall decide on the restriction in accordance with Article 6(10) of Regulation (EU) 2019/942. Where ACER recognises the restriction, it shall request the transmission system operators concerned to perform, within 12 months, the actions referred to in paragraph 6 of this Article in sequence.