Tex. Bus. & Com. Code § 9.409
(a) A term in a letter of credit or a rule of law, statute, regulation, custom, or practice applicable to the letter of credit that prohibits, restricts, or requires the consent of an applicant, issuer, or nominated person to a beneficiary's assignment of or creation of a security interest in a letter-of-credit right is ineffective to the extent that the term or rule of law, statute, regulation, custom, or practice:
(b) To the extent that a term in a letter of credit is ineffective under Subsection (a) but would be effective under law other than this chapter or a custom or practice applicable to the letter of credit, to the transfer of a right to draw or otherwise demand performance under the letter of credit, or to the assignment of a right to proceeds of the letter of credit, the creation, attachment, or perfection of a security interest in the letter-of-credit right:
Amended by Acts 1999, 76th Leg., ch. 414, Sec. 1.01, eff. July 1, 2001;
Acts 2001, 77th Leg., ch. 705, Sec. 14, eff. June 13, 2001.