cubicweb #726172 RQL failed to resolve Etype in multisource setup [deprecated]

The following resource failed for cubicweb.org

>>> cu.execute(u'Any X WHERE X name "quick", X use_group GCW, GCW name "CW"')
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/lib/python2.5/site-packages/cubicweb/dbapi.py", line 668, in execute
    parameters, eid_key, build_descr)
  File "/usr/lib/python2.5/site-packages/Pyro/core.py", line 390, in __call__
    return self.__send(self.__name, args, kwargs)
  File "/usr/lib/python2.5/site-packages/Pyro/core.py", line 468, in _invokePYRO
    return self.adapter.remoteInvocation(name, constants.RIF_VarargsAndKeywords, vargs, kargs)
  File "/usr/lib/python2.5/site-packages/Pyro/protocol.py", line 491, in remoteInvocation
    answer.raiseEx()
  File "/usr/lib/python2.5/site-packages/Pyro/errors.py", line 81, in raiseEx
    raise self.excObj
psycopg2.ProgrammingError: ("column _tx0.cw_name does not exist\nLINE 3: WHERE _TX0.cw_name=E'quick' AND rel_use_group0.eid_from=_TX0...\n              ^\n", 'This error occured remotely   (Pyro). Remote traceback is available.')

Add X is TestConfig solve the Issue.