Tex. Government Code § 813.501: SERVICE CREDITABLE IN EMPLOYEE CLASS.

Service creditable in the employee class of membership is:

(1) membership service in a position included in that class;

(2) military service established as provided by Subchapter D;

(3) service creditable in or transferred from the elected class as provided by Section 813.503; and

(4) administrative board service established as provided by Section 813.502.

Acts 1981, 67th Leg., p. 1876, ch. 453, Sec. 1, eff. Sept. 1, 1981. Renumbered from Vernon's Ann.Civ.St. Title 110B, Sec. 23.501 and amended by Acts 1989, 71st Leg., ch. 179, Sec. 1, eff. Sept. 1, 1989.