(1) The joint and several debtors are obliged in equal proportion in relation to one another unless otherwise determined. If the contribution attributable to a joint and several debtor cannot be obtained from that debtor, the shortfall is to be borne by the other obligors obliged to adjust advancements.
(2) To the extent that a joint and several debtor satisfies the obligee and may demand adjustment of advancements from the other obligors, the claim of the obligee against the other obligors devolves to that debtor. The devolution of ownership may not be asserted to the disadvantage of the creditor.