Article 21 4.

The Commission may at any point in time request the signatories to a self-regulation measure listed in an implementing act adopted pursuant to paragraph 3, second subparagraph, to submit, within an appropriate period of time, a revised and updated version of that measure in view of relevant market or technological developments relating to the product group concerned. Where the Commission has reason to believe that the criteria set out in this Article are no longer fulfilled, the signatories shall submit a revised and updated version of that measure within three months of the request made by the Commission.