Hi kph,
Which version of TestStand are you using? Are you using the Numeric Limit Test or another (custom) step type? Which report options do you have configured? I tried creating a simple sequence file with one Numeric Limit Test step. The pre-expression sets the Step.Result.Numeric to 15 (kilograms, kgs). I have attached both the sequence file and the report it generated (in ascii) that shows the units on line 22.
Regards,