2. The other party may object to an amendment or increase if this unreaso­nably hinders his defence, or if this causes unreasonable delay of the proceedings. The arbitral tribu­nal shall hear the parties and promptly decide on the objections raised by the other party.

3. In case of default of a party as provided in article 36, the arbitral tribunal shall give in writing the defaul­ting party an opportunity to comment on the amendment or increase.

Article 35 - Withdrawal of Request for Arbitration

1. The claimant may withdraw his request for arbitration so long as the respondent has not submitted a statement of defen­ce as referred to in article 24 or, in case the arbi­tration does not take place on the basis of written submis­sions, so long as a hearing has not been held.