15. If a claim of unfair dismissal has been referred for resolution under the Scheme, any other claim, even if part of the same dispute, must be settled separately, or referred to an industrial tribunal or the Fair Employment Tribunal for Northern Ireland, or withdrawn. In the event that different aspects of the same dispute are being heard in an industrial tribunal or the Fair Employment Tribunal for Northern Ireland as well as under the Scheme, the arbitrator may decide, if appropriate or convenient, to postpone the arbitration proceedings pending a determination by an industrial tribunal or the Fair Employment Tribunal for Northern Ireland.