Section 20(1)(a) in Uttar Pradesh Public Premises (Eviction of Unauthorised Occupants) Act, 1972
(a)no suit or other legal proceeding shall he maintained or continued in any Court for the refund of any rent or damages or costs recovered under any repealed enactment where such refund has been claimed merely on the ground that the said repealed enactment has been declared to be unconstitutional and void;