1. A Cancellation Division shall be responsible for taking decisions in relation to:
(a) applications for the revocation or a declaration of invalidity of an EU trade mark;
(b) requests for the assignment of an EU trade mark as provided for in Article 21.
2. The decisions of the Cancellation Divisions shall be taken by three-member groups. At least one member shall be legally qualified. Decisions relating to costs or to procedures as specified in the acts adopted pursuant to Article 161(2) shall be taken by a single member.