Civil Code, Art. 1381

The following contracts are rescissible: (1) Those which are entered into by guardians whenever the wards whom they represent suffer lesion by more than one-fourth of the value of the things which are the object thereof; (2) Those agreed upon in representation of absentees, if the latter suffer the lesion stated in the preceding number; (3) Those undertaken in fraud of creditors when the latter cannot in any other manner collect the claims due them; (4) Those which refer to things under litigation if they have been entered into by the defendant without the knowledge and approval of the litigants or of competent judicial authority; (5) All other contracts specially declared by law to be subject to rescission. (1291a)