ITAT can't decide if an ex-member of ITAT can be debarred from practicing before it

IT : ITAT cannot decide on vires of Rule 13 E of the Income Tax Appellate Tribunal Members (Recruitment and Conditions of Service) Rules, 1963 So question as to whether Shri Deepak R. Shah, advocate and ex-Accountant Member of the Income-tax Appellate Tribunal, is debarred from practicing before the Income Tax Appellate Tribunal, not answered.