In Maharasthra, registration of every leve and license is made compulsory by the Maharas.Rent Control Act, 1999 - check the extract of Section 5. Hence the owner is bound to get this process done or assist you by providing the affidavit. Best Wishes
5. TENANCY AGREEMENT TO BE COMPULSARILY REGISTERED .-
(1) Notwithstanding anything contained in this Act or any other law for the time being in force, any agreement for leave and licence or letting of any premises, entered into between the landlord and the tenant or the licensee, as the case may be, after the commencement of this Act, shall be in writing and shall be registered under the Registration Act, 1908. (2) The responsibility of getting such agreement registered shall be on the landlord and in the absence of the written registered agreement, the contention of the tenant about the terms and conditions subject to which a premises have been given to him by the landlord on leave and licence or have been let to him, shall prevail, unless proved otherwise. (3) Any landlord who contravenes the provisions of this section shall, on conviction, be punished with imprisonment which may extend to three months or with fine not exceeding rupees five thousand or with both.