Rejection of proof of debt: creditor may apply to reverse decision within twenty-one days, subject to tribunal extension. The prescribed form requires the Company Liquidator to notify a claimant that their proof of debt has been rejected wholly or in part, state the grounds for rejection, date and sign the notice, and warn that any application to reverse or vary the decision must be made within twenty-one days of service, subject to the Tribunal's power to extend the time.