Where a person became a substantial shareholder of a company or when changes occurred in the shareholding of a substantial shareholder of the company as a result of the buy back of shares or any sale of its treasury shares, as the case may be by the company, the obligation of that person or the substantial shareholder to notify the company and the Stock Exchange, as provided under section 69E and section 69F of the Act respectively, shall be deemed to have been met by the entry of the details or adjustments in the register of substantial shareholders made in accordance with regulation 18D.