A contract executed under Section 271.054 or 271.056 is not required to be in writing if the work to be performed under the contract:

1. (1) is legal services;
2. (2) is to be done by the regular salaried employees of the issuer; or
3. (3) is to be paid for as the work progresses.

Acts 1987, 70th Leg., ch. 149, Sec. 1, eff. Sept. 1, 1987.