1. Concept
The following contracts are unenforceable, unless they are ratified:
(1) Those entered into in the name of another person by one who has been given no authority or legal representation, or who has acted beyond his powers;
(2) Those that do not comply with the Statute of Frauds as set forth in this number. In the following cases an agreement hereafter made shall be unenforceable by action, unless the same, or some note or memorandum, thereof, be in writing, and subscribed by the party charged, or by his agent; evidence, therefore, of the agreement cannot be received without the writing, or a secondary evidence of its contents:
(a) An agreement that by its terms is not to be performed within a year from the making thereof;
(b) A special promise to answer for the debt, default, or miscarriage of another;
(c) An agreement made in consideration of marriage, other than a mutual promise to marry;
(d) An agreement for the sale of goods, chattels or things in action, at a price not less than five hundred pesos, unless the buyer accept and receive part of such goods and chattels, or the evidences, or some of them, of such things in action or pay at the time some part of the purchase money; but when a sale is made by auction and entry is made by the auctioneer in his sales book, at the time of the sale, of the amount and kind of property sold, terms of sale, price, names of the purchasers and person on whose account the sale is made, it is a sufficient memorandum;
(e) An agreement of the leasing for a longer period than one year, or for the sale of real property or of an interest therein;
(f) A representation as to the credit of a third person.
(3) Those where both parties are incapable of giving consent to a contract. (Article 1403, Ibid.)
2. Ratification
a. Parents or guardians
In a contract where both parties are incapable of giving consent, express or implied ratification by the parent, or guardian, as the case may be, of one of the contracting parties shall give the contract the same effect as if only one of them were incapacitated. (Article 1407, Ibid.)
If ratification is made by the parents or guardians, as the case may be, of both contracting parties, the contract shall be validated from the inception. (Paragraph 2, Article 1407, Ibid.)
b. Contracts infringing statute of frauds
Contracts infringing the Statute of Frauds, referred to in No. 2 of Article 1403, are ratified by the failure to object to the presentation of oral evidence to prove the same, or by the acceptance of benefit under them. (Article 1405, Ibid.)
c. Where public document is necessary
When a contract is enforceable under the Statute of Frauds, and a public document is necessary for its registration in the Registry of Deeds, the parties may avail themselves of the right under Article 1357. (Article 1406, Ibid.)
If the law requires a document or other special form, as in the acts and contracts enumerated in the following article, the contracting parties may compel each other to observe that form, once the contract has been perfected. This right may be exercised simultaneously with the action upon the contract. (Article 1357, Ibid.)
3. Non-assailable by third persons
Unenforceable contracts cannot be assailed by third persons.(Article 1408, Ibid.)
References
⦁ Book IV, Republic Act No. 386, Civil Code