Tex. Bus. & Com. Code § 51.203
An assignee of a business opportunity contract or of the seller's rights under the contract is subject to all equities, rights, and defenses of the purchaser against the seller.
Acts 2007, 80th Leg., R.S., Ch. 885 (H.B. 2278), Sec. 2.01, eff. April 1, 2009.