During the course of an offer, or even before the date of the offer if the board of the offeree company has reason to believe that a bona fide offer might be imminent, no redemption or purchase by the offeree company of its own securities may, except in pursuance of a contract entered into earlier, be effected without the approval of the shareholders at a general meeting. The notice convening the meeting must include information about the offer or anticipated offer. Where an obligation or other special circumstance exists without a formal contract, the CBB must be consulted and its consent to proceed without a shareholders' meeting obtained.