Cap. 12 Art. 633Defective public act which may be admissible in evidence as private writing.

Any act which, by reason of the incompetence or incapacity of the officer by whom it was drawn up, compiled, or published, or which, owing to the absence of some formality prescribed by law, has not the force of a public act, shall be admissible as evidence as a private writing between the parties, if the parties have signed or marked the same, or if it is proved that such act has been drawn up or signed by some other person acting on their instructions.