(1) On the death of the person obliged, the obligation to maintain passes to the heir as a liability of the estate. The restrictions under section 1581 do not apply. However, the heir is not liable beyond a sum that corresponds to the compulsory portion which would be due to the person entitled if the marriage had not been dissolved by divorce.
(2) In the calculation of the compulsory portion, special elements resulting from the matrimonial property regime under which the divorced spouses lived are not taken into account.