P.R. Laws tit. 30, § 2777
No document or legal instrument that has not been recorded in the Registry by which rights, subject to registration according to this subtitle, are constituted, conveyed, recognized, modified or extinguished shall be admitted in the courts or in those government bodies which exercise quasi-judicial powers.
Nevertheless, a document that is not recorded and should have been may be admitted in prejudice of a third party, if the purpose of the presentation is only to corroborate another later title which was recorded.
The document mentioned may also be admitted when a rectification is made in the Registry or when it is presented in order to request a statement of nullity and subsequent cancellation of an entry that prevents the registration of that document.
History —Mortgage Law, 1979, § 252.