I am not able to dimension the wooden baffles that would cut through a tube in the model due to the error as listed in the title.

I tried taking a section view but I still failed. One of the baffles couldn't be selected by me as a separate body "Select bodies" so I just made a separate part for it and took the drawing view from there. If you can advise me on this as well, it will be great.

I have attached the drawing and the part files.

Please help. Also the convert entities option is disabled in the drawing view so how am I supposed to work around this and taking a section view does not improve my situation.