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In previous releases of UML2, workarounds were put in place to deal with bidirectional references that don't line up during validation (because they are derived and are missing the necessary subsets) - see bug 320318 and bug 323000. The same workaround needs to be applied for the Class::extension-Extension::metaclass pair of references.
The fix has been committed to CVS.
The fix is available in 3.2.1 maintenance build M201108110857.