What is Falsa Demonstratio Non Nocet, Cum De Corpore (persona) Constat?

Legal Definition
False description does not injure or vitiate, provided the thing or person intended has once been sufficiently described. Mere false description does not make an instrument inoperative. Broom, Max. 629 ; 6 Term, 676; 11 Mees. & W. 189; Clcaveland v. Smith, 2 Story, 291, Fed. Cas. No. 2,874.
-- Black's Law Dictionary