I've modeled the following deceptively simple sheet metal part:



However I'm having some trouble dimensioning it. I created the slots as wrapped features but when I try to dimension them in the flattened view in a drawing I'm told something along the lines of "the selected edge can't be converted into a line or circular arc".

I can add the slots to the flattened sheet metal but then I can't use radial dimensions to locate them which is what I want so I can preserve clear design intent.

Is there a decent way to do this? Maybe the wrap feature is the wrong way to go?

edit: I guess I should mention I'm using SW2008