ticket search by dynamic field

Hey!
I've been trying to use the generic interface to search tickets by a
dynamic field. I'm using java client.
It seems to be correct accordingly with the documentation. The problem is,
the search is returning all tickets instead of just
return the field XYZ = 'test'

is it a bug? What am I doing wrong?

Thanks

 Incoming data before mapping (2012-09-06 10:52:16, debug)

$VAR1 = {
  'DynamicField_XYZ' => {
    'Equals' => 'test'
  },
  'Password' => 'root',
  'UserLogin' => 'root@localhost'
};

  <http://192.168.20.168/otrs/index.pl#>
 Incoming data after mapping (2012-09-06 10:52:16, debug)

$VAR1 = {
  'DynamicField_XYZ' => {
    'Equals' => 'test'
  },
  'Password' => 'root',
  'UserLogin' => 'root@localhost'
};

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