When it should be absolutely impossible to decide the doubts by the rules established in the preceding sections, if they deal with incidental circumstances of the contract, and said contract involves a good consideration, they shall be decided in favor of the smallest transmission of rights and interest. Should the contract involve a valuable consideration, the doubt shall be decided in favor of the greatest reciprocity of interests.\nShould the doubts, the decision of which is referred to in this section, involve the principal object of the contract so that the intention or will of the contracting parties cannot be ascertained, the contract shall be void.\nHistory —Civil Code, 1930, § 1241.
Puerto Rico Legal Code