Error received when calling web service from database.

Hi folks,
I am trying to call a web service from the database (using the Oracle database web services call-out utility) and I am getting the following error:
ERROR at line 1:
ORA-29532: Java call terminated by uncaught Java exception:
java.rmi.RemoteException:
oracle.j2ee.ws.common.encoding.DeserializationException:unknown prefix in QName
literal: null
ORA-06512: at "SCOTT.PENALTY_ALG_WS_WRAPPER", line 1
ORA-06512: at "SCOTT.ABC_PROC", line 131
ORA-06512: at line 1
This is the error I see in the trace file on the database:
*** 2009-11-10 11:30:37.353
java.rmi.RemoteException: oracle.j2ee.ws.common.encoding.DeserializationException:unknown prefix in QName literal: null
     at oracle.j2ee.ws.common.encoding.simpletype.XSDQNameEncoder.stringToObject(XSDQNameEncoder.java:75)
     at oracle.j2ee.ws.common.encoding.SimpleTypeSerializer.deserialize(SimpleTypeSerializer.java:141)
     at oracle.j2ee.ws.common.encoding.SOAPFaultInfoSerializer.doDeserializeSOAP11(SOAPFaultInfoSerializer.java:120)
     at oracle.j2ee.ws.common.encoding.SOAPFaultInfoSerializer.doDeserialize(SOAPFaultInfoSerializer.java:94)
     at oracle.j2ee.ws.common.encoding.ObjectSerializerBase.deserialize(ObjectSerializerBase.java:180)
     at oracle.j2ee.ws.client.StreamingSender._readBodyFaultElement(StreamingSender.java:513)
     at oracle.j2ee.ws.client.StreamingSender._sendImpl(StreamingSender.java:321)
     at oracle.j2ee.ws.client.StreamingSender._send(StreamingSender.java:112)
     at genproxy.runtime.PenaltyAlgBPELProcessBinding_Stub.process(genproxy.runtime.PenaltyAlgBPELProcessBinding_Stub:80)
     at genproxy.PenaltyAlgBPELProcessPortClient.process(PenaltyAlgBPELProcessPortClient.java:40)
     at genproxy.PenaltyAlgBPELProcessPortClientJPub.process(PenaltyAlgBPELProcessPortClientJPub.java:46)
This web service is deployed on Oracle app server 10.1.3.4. It calls a BPEL process which in turn calls Oracle Business Rules.
I used JPublisher to create the stubs for the web service and load them into the database.
Any ideas on what might be causing this error?
Thanks.
Kashif

Well, I think so... I've followed all the steps, and my merged WSDL file seems like the one in page 12...
Any suggestion, please?
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