(2)(a)The person responsible for paying to a non-resident any sum as mentioned in section 393(2) (Table: Sl. No. 17), may make an application to the Assessing Officer in such form and manner as may be prescribed, where he considers that the whole of such sum would not be chargeable in the case of the recipient;(b)the application under clause (a) shall be for determination of the appropriate proportion of the sum chargeable to tax, by the Assessing Officer in the manner as may be prescribed; and(c)when the determination is made by the Assessing Officer as per clause (b), the tax shall be deducted under section 393(2) (Table: Sl. No. 17) only on that proportion of sum which is chargeable to tax under the Act.