Objects saved back to
their attached drawings replace the original objects.
AutoCAD Map 3D lets you save
objects to attached drawings in read-only directories.
You cannot undo a Save
To Source Drawings operation. Once you perform a Save
DWG Save Set operation, attached drawings contain the
you work with an attached drawing from a previous release and save
back your changes, AutoCAD Map 3D updates the attached drawing to the
current format. To retain the attached drawing in the previous drawing
format, do not save back your changes.