Article 96 - Performance of non-monetary obligation
Where a party who owes an obligation other than one to pay money does not perform, the other party may require performance, unless:
(1) performance is impossible in law or fact;
(2) performance or, where relevant, enforcement is unreasonably burdensome or expensive;
(3) the party entitled to performance may reasonably obtain performance from another source;
(4) performance is of an exclusively personal character; or
(5) the party entitled to performance does not require performance within a reasonable time after he has, or ought to have, become aware of the non-performance.