Tex. Finance Code § 347.506: WHEN ACT OR OMISSION NOT VIOLATION.

(a) An act or omission does not violate this chapter if the act or omission conforms to an interpretation of any provision of this chapter that is in effect at the time of the act or omission and that:

(1) was made by the commissioner under Section 14.108; or

(2) is a final decision of an appellate court of this state or the United States.

(b) If the interpretation or decision is modified, rescinded, or invalidated by a subsequent interpretation or final decision, the subsequent interpretation or final decision does not apply to a credit transaction made before the effective date of the subsequent interpretation or final decision.

Acts 1997, 75th Leg., ch. 1008, Sec. 1, eff. Sept. 1, 1997.