Introduced a new field for the leases called 'status' which can have one of the following values: 'pending', 'accepted', 'active', 'past', 'cancelled'. Refactored the code of the am_manager such that it pass the test where we don't delete the lease but we just cancell it. Finally fixed a bug in OResource file where we weren't saving the value of oproperty after we had set it.