Follow The Code: Commission Disputes
Don’t assume Realtors® can arbitrate all commission disputes.
Article 17 defines an “arbitrable issue” as a contractual dispute between Realtor® Principals (Brokers) of different firms.
Have you arranged for a referral commission to be paid without the signature/acceptance of the brokers on an agreement? If not, an arbitration request would probably be dismissed by the Grievance Committee for lack of a contractual relationship.