Issue with default SRS in WFS 1.1.0 tc28.1

We are testing our WFS1.1.0 service with teamengine-2.0. The wfs-1.1.0-Basic-GetFeature-tc28.1 test is failing to return any features. The test case has no SRS defined, but the BBOX specifies Envelope in EPSG:4326. The test fails as it expects the result to be in the default SRS as specified in Capabilitites, which for our system is EPSG:54003. It seems that this test is impossible to pass unless the default SRS is EPSG:4326, which in our system it is not.