I have been trying to add an angle dimensions in a section view. It is from the center line of the part to the center line of a hole (see pic). I want to be able to show that the hole is at 180° from verticle. I added the center mark & centerline. Eveytime I try it says that it could not create ref. dimension. I have did this many times but today it will NOT let me. Is there a setting that may have been changed or am I missing something?