Description of problem: It is not possible to purge/reroute/move messages belonging to default group only (messages with group header not send or equal to empty string) qpid: call 121 query queue q2 qpid: OK (0) - {u'results': {u'qpid.message_group_queue': {u'group_state': [{u'timestamp': 0L, u'msg_count': 5L, u'group_id': 'KEY', u'consumer': ''}, {u'timestamp': 0L, u'msg_count': 5L, u'group_id': 'qpid.no-group', u'consumer': ''}], u'group_header_key':'GROUP_KEY'}}} qpid: call 134 purge 0 {"filter_type":"header_match_str","filter_params":{"header_key":"GROUP_KEY","header_value":"qpid.no-group"}} qpid: OK (0) - {} qpid: call 134 purge 0 {"filter_type":"header_match_str","filter_params":{"header_key":"GROUP_KEY","header_value":""}} qpid: OK (0) - {} qpid: call 121 query queue q2 qpid: OK (0) - {u'results': {u'qpid.message_group_queue': {u'group_state': [{u'timestamp': 0L, u'msg_count': 5L, u'group_id': 'KEY', u'consumer': ''}, {u'timestamp': 0L, u'msg_count': 5L, u'group_id': 'qpid.no-group', u'consumer': ''}], u'group_header_key':'GROUP_KEY'}}} Version-Release number of selected component (if applicable): python-qpid-0.14-1.el5 python-qpid-qmf-0.14-2.el5 qpid-cpp-client-0.14-3.el5 qpid-cpp-client-devel-0.14-3.el5 qpid-cpp-client-devel-docs-0.14-3.el5 qpid-cpp-client-ssl-0.14-3.el5 qpid-cpp-server-0.14-3.el5 qpid-cpp-server-cluster-0.14-3.el5 qpid-cpp-server-devel-0.14-3.el5 qpid-cpp-server-ssl-0.14-3.el5 qpid-cpp-server-store-0.14-3.el5 qpid-cpp-server-xml-0.14-3.el5 qpid-java-client-0.14-1.el5 qpid-java-common-0.14-1.el5 qpid-java-example-0.14-1.el5 qpid-qmf-0.14-2.el5 qpid-qmf-devel-0.14-2.el5 qpid-tests-0.14-1.el5 qpid-tools-0.14-1.el5 How reproducible: 100% Steps to Reproduce: see problem description above Actual results: unable to use filter to match messages belonging to default group only Expected results: messages belonging to default group only can be matched with the filter