You are right, I can't prove that the unit was typed so I will include this with my labeling error. I know when I retyype a unit and I find it was already typed (retype label missing) I put a not in comments on the unit. I see the weakness in my system, I need a second req ordered on a unit that is typed twice to tract this issue. I don't know if this would have caught the error but it would have a least made them think about what they were doing.