About Missing or Circular External References
If a referenced drawing cannot be located when you open a drawing, several options
available to you. If a nested reference refers to itself or the drawing in which it’s
references, an error is displayed.
The program stores the folder path of the referenced drawing. Each time you open or
plot the drawing, or use the Reload option in the External References palette to update
the xref, the program checks the folder path to determine the name and location of
the referenced drawing file.
IIf the name or location of the drawing file has changed, the program cannot locate
or reload the xref, and it displays an error message that displays the folder path
and name of the missing drawing file.
In the drawing, at each insertion of the missing xref, the program displays text that
displays the folder path of the missing xref. You can use the XREF Path option to
update or correct the path.
Along with error messages being displayed at the Command prompt, a task dialog box
might be displayed that allows you to ignore all missing xrefs or update their folder
locations. You can use the External References palette to update the locations of
the unresolved references.
To avoid these errors make sure that when you transfer or distribute drawing files
that have xrefs attached, you also include all the referenced files.
Changing Nested Xref Paths
When a drawing is opened and a nested xref is loaded, the program attempts to find
the xref in the original xref path first. If the xref is not found, the following
search is initiated in the order shown:
- Current folder of the host drawing
- Project search paths defined on the Files tab in the Options dialog box and in the
PROJECTNAME system variable (not available in AutoCAD LT)
- Support search paths defined on the Files tab in the Options dialog box
- Start In folder specified in the Microsoft آ® Windows آ® application shortcut
This search order helps ensure that revisions made to the xref are reflected in the
current drawing, and also makes it possible for the xref to be found if its folder
path has changed.
Resolving Circular References
A drawing that contains a sequence of nested references that refers back to itself
is considered a circular reference. For example, if drawing A attaches drawing B,
which attaches drawing C, which attaches drawing A, the reference sequence ABCA
is a circular reference.
If the program detects a circular reference while attaching an xref, a warning is
displayed asking you if you want to continue. If you respond with yes, the program
reads in the xref and any nested xrefs to the point where it detects the circularity.
If you respond with no, the process is halted and the xref is not attached.
If a circular reference is encountered while loading a drawing, an error message is
displayed and the circular reference for the current session is broken. For example,
if you have the circular reference ABCA, and you open a.dwg, the program detects and breaks the circularity between c.dwg and a.dwg. The following error message is displayed:
Breaking circular reference from C to current drawing.
e program stores the folder path of the referenced drawing. Each time you open or plot the drawing, or use the Reload option in the External References …referenced drawing cannot be located when you open a drawing, several options available to you. If a referenced drawing contains a sequence of nested …… If a referenced drawing cannot be located when you open a drawing, several options available to you. If a nested reference refers to itself or the …circular reference while attaching an xref, a warning is … Resolve Name Conflicts in External References · Resolve Missing External …… … setting up xref's for my projects (this helps me avoid the dreaded circular xref's). … fixing this typically meant detaching the xref, and then reattaching it – losing … Changing the attachment type of an existing External Reference (xref) … Converting a Full Path external reference (xref) to a Relative Path xref.missing ref. … (component, that is external or component that no longer exists in your assembly). … with the drawing having simp. reps. set and those were creating circular references.… The Global Reference Viewer has been around for many releases, but interrogating the … Troubleshooting Circular and External References … When external or missing model dependencies are found, it may be necessary to …… Learn the reasons for missing files and best practices for resolving this issue. … Search file locations for external references. 3 thru 5) Here's the …