Description of problem:

While I'm able to add a tag to a test plan I am not able to remove
the same tag from the same test plan and get a "Permission denied"
error instead:

TestPlan.add_tag(289, "Tag")
OK

TestPlan.remove_tag(289, "Tag")
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/lib64/python2.6/xmlrpclib.py", line 1199, in __call__
    return self.__send(self.__name, args)
  File "/usr/lib64/python2.6/xmlrpclib.py", line 1489, in __request
    verbose=self.__verbose
  File "nitrate.py", line 120, in request_with_cookies
    return self._parse_response(h.getfile(), sock)
  File "/usr/lib64/python2.6/xmlrpclib.py", line 1392, in _parse_response
    return u.close()
  File "/usr/lib64/python2.6/xmlrpclib.py", line 838, in close
    raise Fault(**self._stack[0])
xmlrpclib.Fault: <Fault 1: 'PermissionDenied: Permission denied.'>

Version-Release number of selected component (if applicable):
Nitrate 3.4.1