"Disputes arising from or in connection with the contract shall not be subject to the jurisdiction of general courts of law but shall be settled by arbitration.
The following procedure shall apply with respect to the arbitration:
A counterclaim or set-off claim based on the same contract as the original suit shall be settled by the same arbitration tribunal in which the original suit is considered.
The arbitration award shall be final and binding upon the parties.
In the dealings between the parties the substantive law of the seller's country shall apply with respect to matters which have not been settled or have been settled insufficiently in the contract."