Structure Inspector drag and drop not working

[jcgam]

When I try to drag a line from one part to another I see a green plus icon, but nothing happens. Is there a trick to dragging lines from one part to another?

[jcgam]

I see now - you can't drag the last and only line in a part, but if you copy it THEN you can drag it to another part.

[musicdevelopments]

Yes, exactly!
Thanks,
Attila