(a) Pleadings include notices of hearing, motions, and exceptions. Regardless of any error in its designation, a pleading shall be accorded its true status in the proceeding in which it is filed.(b) Amended and supplemental pleadings may be filed at such time so as not to operate as a surprise on the opposing party.(c) The administrative law judge may allow a pleading to be amended during the contested case evidentiary hearing on the merits and shall do so freely when the trial amendment will facilitate determining the merits of the case but will not unduly prejudice the objecting party.(d) In addition to this subchapter, Texas Administrative Code,