An arbitration must be initiated within two years of the date the claimant knew or should have known of the dispute on which the claim is based except, that claims filed pursuant to Rule 600.C. must be submitted within 10 days of receiving notice that the Exchange has refused to compensate the claimant for the claimed loss. 

Counterclaims, cross-claims and third-party claims must be submitted no later than the date on which the answer is due. (1/13/08