(5)On receipt of any such requisition, the Certificate-Officer may, in accordance with such rules as the [State] Government may prescribe in this behalf, and if he is satisfied that the arrear is due, sign a certificate in the prescribed form stating that the arrear is due, and shall include in the certificate the fee paid under sub-section (4), and shall cause the certificate to be filed in his office :Provided that,-(a)no certificate shall be signed for the recovery of arrears of rent of a tenancy regarding which a suit has been instituted in the Court of the Deputy Commissioner for the alteration of the rent payable by the tenant, or the determination of his status as a tenant, in respect of the period during which it is alleged in the requisition made under sub-section (3) that the arrears of rent sought to be recovered have accrued, and(b)if, after the signing of a certificate, it is found that such a suit was instituted in the Court of the Deputy Commissioner before the certificate was signed, such certificate shall be cancelled.