(2) The parties may submit with their statements all documents they consider to be relevant or may add a reference to the documents or other evidence they will submit.
(3) Unless otherwise agreed by the parties, either party may amend or supplement the claim or defense of the party during the course of the arbitral proceedings, unless the arbitral tribunal considers it inappropriate to allow the amendment or supplement having regard to the delay in making it. [1991 c.405 §26]