an be
assigned a serialization level which doesn't include type information 
in the archive.  This would preclude the assignment
of a new version number to the type.  This error
traps attempts to assign a version number in this case.
This has to be a user error.
</dd>

<dt><h2><a name="object_tracking">object_tracking</a> - warning</h2></dt>
<dd>
The following code will display a message when compiled:

<code style="white-space: normal"><pre>
T t;
ar &lt;&lt; t;
</pre></code>

unless the tracking_level seri