A registered dealer who claims exemption form payment of tax in respect of any goods on the ground that sale of such goods have been made in the course of inter-State trade or commerce, to any official, personnel, consular or diplomatic agent of foreign diplomatic mission or consulate in India or United Nations or other International Body for the purposes specified under sub-section (3) of section 6 of the Act, shall obtain a certificate in Form J prescribed under the Central Sales Tax (Registration and Turnover) Rules, 1957 duly filled in and signed by the purchaser/ authorized officer with seal of the diplomatic mission / consulate / International body referred to in sub-section (3) of section 6 of the Act in support of purchase of such goods and shall furnish the portion marked '' to the assessing authority alongwith the Statement in Form F within three months after the end of the period to which the declaration relates and the portion marked '' shall be retained by him.