ABSTRACT
Obligations must be performed in a proper manner in accordance with the terms of the obligation and the requirements of a statute, legal acts, and in the absence of such terms and requirements, in accordance with the customs of trade or other usually made requirements. Unilateral refusal to perform an obligation and unilateral change in its terms is not allowed with the exception of cases provided by a statute. Unilateral refusal to perform an obligation connected with the conduct by its parties of entrepreneurial activity and unilateral change in the terms of such an obligation is allowed in cases provided by contract unless otherwise follows from a statute or the nature of the obligation. A debtor has the right to perform an obligation early unless otherwise provided by a statute, other legal acts or the terms of the obligation or follows from its nature. Joint and several debtors are obligated until the time when the obligation is performed in full.
