34 Tex. Admin. Code § 67.33
Any pleading except notices of issues may be amended at any time, provided that it does not act as a surprise to the opposite party. Any amendment to a pleading, which operates as a surprise to any other party, may be granted upon written motion showing that no harm will result.
Source Note:The provisions of this §67.33 adopted to be effective March 19, 1986, 11 TexReg 1149.