[Greg Needel]

I don't have my book in front of me but I don't recall anything on the topic. I would not use the same label for a detail and a section, just for clarity. I think the only case which I would use the same labels for both is if they were included in the same feature, such as an undercut detail call out where I also show a section view to get the geometry. People naturally associate letters so it wouldn't be good practice to use the same labels for un-associated details.