Tex. Business & Commerce Code § 56.052

(a) Except as provided by Subsection (d), a contingent payor or its surety may not enforce a contingent payment clause as to work performed or materials delivered after the contingent payor receives written notice from the contingent payee objecting to the further enforceability of the contingent payment clause as provided by this chapter and the notice becomes effective as provided by Subsection (b). The contingent payee may send written notice only after the 45th day after the date the contingent payee submits a written request for payment to the contingent payor that is in a form substantially in accordance with the contingent payee's contract requirements for the contents of a regular progress payment request or an invoice.

(b) For purposes of Subsection (a), the written notice becomes effective on the latest of:

(1) the 10th day after the date the contingent payor receives the notice;

(2) the eighth day after the date interest begins to accrue against the obligor under:

(A) Section 28.004, Property Code, under a contract for a private project governed by Chapter 28, Property Code; or

(B) 31 U.S.C. Section 3903(a)(6), under a contract for a public project governed by 40 U.S.C. Section 3131; or

(3) the 11th day after the date interest begins to accrue against the obligor under Section 2251.025, Government Code, under a contract for a public project governed by Chapter 2251, Government Code.

(c) A notice given by a contingent payee under Subsection (a) does not prevent enforcement of a contingent payment clause if:

(1) the obligor has a dispute under Chapter 28, Property Code, Chapter 2251, Government Code, or 31 U.S.C. Chapter 39 as a result of the contingent payee's failure to meet the contingent payee's contractual requirements; and

(2) the contingent payor gives notice in writing to the contingent payee that the written notice given under Subsection (a) does not prevent enforcement of the contingent payment clause under this subsection and the contingent payee receives the notice under this subdivision not later than the later of:

(A) the fifth day before the date the written notice from the contingent payee under Subsection (a) becomes effective under Subsection (b); or

(B) the fifth day after the date the contingent payor receives the written notice from the contingent payee under Subsection (a).

(d) A written notice given by a contingent payee under Subsection (a) does not prevent the enforcement of a contingent payment clause to the extent that the funds are not collectible as a result of a primary obligor's successful assertion of a defense of sovereign immunity, if the contingent payor has exhausted all of its rights and remedies under its contract with the primary obligor and under Chapter 2251, Government Code. This subsection does not:

(1) create or validate a defense of sovereign immunity; or

(2) extend to a primary obligor a defense or right that did not exist before September 1, 2007.

(e) On receipt of payment by the contingent payee of the unpaid indebtedness giving rise to the written notice provided by the contingent payee under Subsection (a), the contingent payment clause is reinstated as to work performed or materials furnished after the receipt of the payment, subject to the provisions of this chapter.