1. Members of the Boards of Appeal may not take part in any appeal proceedings if they have any personal interest therein, or if they have previously been involved as representatives of one of the parties to proceedings, or if they participated in the decision under appeal.
2. If, for one of the reasons mentioned in paragraph 1 or for any other reason, a member of a Board of Appeal considers that he should not take part in any appeal proceedings, he shall inform the Board of Appeal accordingly.
3. Members of the Boards of Appeal may be objected to by any party to the appeal proceedings for one of the reasons mentioned in paragraph 1, or if suspected of partiality. An objection shall not be admissible if, while being aware of a reason for objecting, the party to the appeal proceedings has taken a procedural step. No objection may be based on the nationality of members.
4. The Boards of Appeal shall decide as to the action to be taken in the cases specified in paragraphs 2 and 3 without the participation of the member concerned. For the purposes of taking this decision, the member who withdraws or has been objected to shall be replaced in the Board of Appeal by his alternate.