Civil Code, Art. 1510

If a document of title which contains an undertaking by a carrier, warehouseman or other bailee to deliver the goods to bearer, to a specified person or order of a specified person or which contains words of like import, has placed upon it the words "not negotiable," "non-negotiable" or the like, such document may nevertheless be negotiated by the holder and is a negotiable document of title within the meaning of this Title. But nothing in this Title contained shall be construed as limiting or defining the effect upon the obligations of the carrier, warehouseman, or other bailee issuing a document of title or placing thereon the words "not negotiable," "non-negotiable," or the like. (n)