6. The remission of the whole obligation, obtained by one of the solidary debtors, does not entitle him to reimbursement from his co- debtors(Art. 1220)7. A solidary debtor may, in actions filed by the creditor, avail himself of all defenses which are derived from the nature of the obligation and of those which are personal to him, or pertain to his own share. With respect to those which personally belong to the others, he may avail himself thereof only as regards that part of the debt for which the latter are responsible. (Art. 1222)