The participating and parent undertakings referred to in the second and third paragraphs of Article L. 356-2 respectively shall put in place appropriate structures and systems at group level to meet the requirements set out in Article L. 356-23. Pursuant to the provisions of Article L. 356-18, they shall draw up written policies guaranteeing that the information published pursuant to Article L. 356-23 complies with the requirements of this Title at all times.