(1) If a person has disposed over a thing, and the disposition is subject to a condition precedent, then any further disposition which the person makes as regards the thing during the period pending fulfilment of the condition is ineffective on the satisfaction of the condition to the extent that it would frustrate or impair the effect subject to the condition. Such a disposition is equivalent to a disposition that is effected, during the period pending fulfilment of the condition, by way of compulsory enforcement or enforcement of a seizure or by the insolvency administrator.
(2) In the case of a condition subsequent, the same applies to the dispositions of a person whose right expires on the fulfilment of the condition.
(3) The provisions to the benefit of those who derive rights from an unauthorised person apply accordingly.