Article 59 4.

Any party to the appeal proceedings may object to the participation of a member of the Board of Appeal on any of the grounds referred to in paragraphs 1 and 2, or if suspected of bias.

No objection may be based on the nationality of members nor shall it be admissible if, while being aware of a reason for objecting, the party to the appeal proceedings has nonetheless taken a procedural step other than objecting to the composition of the Board of Appeal.