9. When any document purporting to be signed by the Commanding Officer of a soldier who is a party to any proceeding is produced by or on behalf of the soldier before the Court in which the proceeding is pending and is to the effect that the soldier-(a) is on leave of absence for a period not exceeding two months, and is on the expiration of his leave to proceed on service under special conditions, or (b) is on sick leave for a period not exceeding three months, and is on the expiration of his leave to rejoin his unit with a view to proceeding on service under special conditions, the proceeding in respect of such soldier may, in any case such as is referred to in the proviso to sub-section (1) of section 6 and shall, in any other case, be postponed in the manner provided in section 7.