Hey, relax. This is a voluntary newsgroup! Sheesh!
It took me a few seconds in a search of the Autodesk Knowledge base to come
up with the following:
Issue
The following error message is displayed on the command line when you open a
file:
Warning Multiply Owned Object Handle 1818F
Note: The object handle varies. In this example, the problem
is caused by the object handle, 1818F.
It may appear that there are no problems with the data, because after the
error, you are able to open and work on the drawing as usual. However, you are
concerned that the errors could mean there is corruption or other problems with
the file.
name=section2>Solution
To remove the object handle identified by the error, type the following
AutoLISP expression at the Command prompt and press ENTER:
Warning: Please use caution when implementing this
solution. The AutoLISP expression that follows simply deletes the object; it
does not ask for confirmation, and it does not tell you what type of object
you are deleting. For example, the object you are deleting could be an
assembly constraint. Back up the file before executing the
following code and saving the file.
(entdel (handent "<Handle ID>"))
where <Handle ID> is the object handle specified in the
error you receive, for example, 1818F.
After deleting the object handle you can use AUDIT to check for any other
potential problems.
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