When you tried to attach an external reference using a relative path, you received the following message:
External Reference - Relative path cannot be assigned
You will receive this error message if the drawing file that is being referenced is located on a different local hard drive or on a network server.
When you attach external references located on different local hard drives or network servers, you should use the full path.
Note: Before you attach an external reference to a drawing, the drawing file needs to be saved.
Products: AutoCAD;AutoCAD LT