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I want to refer to the data shortcut for a surface. However, make reference button is grey out. What could be the possible reasons? Thanks!
Here is a weird thing. When I copy the same surface from another drawing, the current drawing won't me use the same name because it's duplicated. However, as I look from the toolspace, there is no surface object in the file. Does this mean there are some dummy ghost surface inside? I have purged already!