2. If one of the parties, duly notified under these Rules, fails to appear at a hearing, without showing sufficient cause for such failure, the arbitral tribunal may proceed with the arbitration.
3. If one of the parties, duly invited to produce documentary evidence, fails to do so within the established period of time, without showing sufficient cause for such failure, the arbitral tribunal may make the award on the evidence before it.

Closure of Hearings

Article 29
1. The arbitral tribunal may inquire of the parties if they have any further proof to offer or witnesses to be heard or submissions to make and, if there are none, it may declare the hearings closed.
2. The arbitral tribunal may, if it considers it necessary owing to exceptional circumstances, decide, on its own motion or upon application of a party, to reopen the hearings at any time before the award is made.

Waiver of Rules

Article 30
A party, who knows that any provision of, or requirement under, these Rules has not been complied with and yet proceeds with the arbitration without promptly stating his objection to such non-compliance, shall be deemed to have waived his right to object.