If a referenced drawing cannot be loaded when you open a drawing, an error message is displayed.
If a referenced drawing cannot be located when you open a drawing, an error message is displayed. There are several options available to you if this occurs.
If a referenced drawing contains a sequence of nested references that refers back to itself, an error message is displayed.
When you attach an xref, the names of its blocks, dimensioning styles, layers, linetypes, and text styles are differentiated from those in the current drawing.
You can maintain a record of actions while attaching, detaching, and reloading xrefs and while loading a drawing containing xrefs.