(4)Where, during the previous year in which a [***] feature film is certified for release by the Board of Film Censors, the film producer does not himself exhibit the film on a commercial basis or does not sell the rights of exhibition of the film, no deduction shall be allowed in respect of the cost of production of the film in computing the profits and gains of such previous year; and the entire cost of production of the film shall be carried forward to the next following previous year and allowed as a deduction in that year.
