Except as otherwise provided by Chapter 9 of the Louisiana Commercial Laws, R.S. 10:9-101 et seq., where applicable, a transfer or an encumbrance by a beneficiary of his interest shall be by authentic act or by act under private signature executed in the presence of two witnesses and duly acknowledged by the beneficiary or by the affidavit of one of the attesting witnesses.  Except as otherwise provided by Chapter 9 of the Louisiana Commercial Laws, R.S. 10:9-101 et seq., where applicable, the transfer or encumbrance is not effective as to a trustee until a copy of the authentic act or a copy of the acknowledged act is received by him.  

Acts 1991, No. 665, §1.