The same cause of action, and no other, that was tried before the associate circuit judge, shall be tried before the judge upon the trial de novo; provided, that new parties, plaintiff or defendant, necessary to a complete determination of the cause of action, may be added in the trial de novo.
§ 512.280, RSMo
RSMo 1939 § 2744, A.L. 1945 p. 765 § 139, A.L. 1978 H.B. 1634
Effective 1/2/1979