When working in dwg mode and want to reference a dwg. The nested choice is not on. Posibility of autocad have also a overlay and attached choice. And in OBD the choice is already made. Please let the designer make the choice what he/she wants to select. Because OBD wants to reference all files. Tooks time. And I just want to reference only one design and not all designs the other Autocad user see in their file. And if the Autocad designer doesn't send me the other files, OBD try to search the other files also. So it took a lot of time.