Tex. Government Code § 311.034

In order to preserve the legislature's interest in managing state fiscal matters through the appropriations process, a statute shall not be construed as a waiver of sovereign immunity unless the waiver is effected by clear and unambiguous language. In a statute, the use of "person," as defined by Section 311.005 to include governmental entities, does not indicate legislative intent to waive sovereign immunity unless the context of the statute indicates no other reasonable construction. Statutory prerequisites to a suit, including the provision of notice, are jurisdictional requirements in all suits against a governmental entity.