When a company in business rescue is a creditor of another company (whether or not also in business rescue), the right to vote on the debtor company's business rescue plan vests in the creditor company's business rescue practitioners, not its board of directors. This is because the 'full management control' conferred on business rescue practitioners by section 140(1)(a) of the Companies Act 71 of 2008 includes control over the company's property and assets, of which the debtors' book forms part. Voting as a creditor on a debtor's business rescue plan constitutes a decision over the company's property and therefore falls within the practitioner's full management control. This interpretation is supported by the definition of 'business rescue' in section 128(1)(b), which expressly includes management of the company's property, and by sections 133, 134, 141 and 150, which confer extensive powers over the company's property on practitioners. The power to vote on a debtor's plan is essential for practitioners to fulfill their statutory duties to investigate the company's affairs and develop a business rescue plan. Section 66(1), which confers plenary powers on the board, operates subject to exceptions in the Act, and Chapter 6 is such an exception.