I've made a copy of an existing part (Save as > Save as copy and open), made some modifications and saved it once more: a revision part is completed.

In order to save some time, I did the same for the slddrw file, and in there I replaced the old part for the new one. This drawing file however, has a section view that shows the dimensions as 'dangling' (see screen shot). Is this fixable or should I just toss it and replace with a newly made section view?