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The idref refers to an element that was not found (no matching id found): 'null'
com.bea.sdo.SDOUnmarshalException: The idref refers to an element that was not found (no matching id found): 'null'	at com.bea.sdo.impl.marshal.PlainChangeSummaryUnmarshaller.resolveObjectReference(PlainChangeSummaryUnmarshaller.java:2211)	at com.bea.sdo.impl.marshal.PlainChangeSummaryUnmarshaller.resolveDataObjectReference(PlainChangeSummaryUnmarshaller.java:2183)	at com.bea.sdo.impl.marshal.PlainChangeSummaryUnmarshaller.setRootObject(PlainChangeSummaryUnmarshaller.java:797)	at com.bea.sdo.impl.marshal.PlainUnmarshaller.endElement(PlainUnmarshaller.java:563)	at com.bea.sdo.impl.marshal.DOMLoader.processElement(DOMLoader.java:224)	at com.bea.sdo.impl.marshal.DOMLoader.load(DOMLoader.java:77)	at com.bea.sdo.impl.helpers.XMLHelperImpl.load(XMLHelperImpl.java:135)	at com.bea.ld.server.XQueryInvocation.createIteratorForChangedElement(XQueryInvocation.java:407)	at com.bea.ld.server.XQueryInvocation.createIterator(XQueryInvocation.java:215)	at com.bea.ld.server.XQueryInvocation.bind(XQueryInvocation.java:185)	at com.bea.ld.EJBRequestHandler.invokeQueryInternal(EJBRequestHandler.java:594)	at com.bea.ld.EJBRequestHandler.invokeOperationInternal(EJBRequestHandler.java:478)	at com.bea.ld.EJBRequestHandler.invokeOperation(EJBRequestHandler.java:323)	at com.bea.ld.ServerWrapperBean.invoke(ServerWrapperBean.java:153)	at com.bea.ld.ServerWrapperBean.invokeOperation(ServerWrapperBean.java:80)	at com.bea.ld.ServerWrapper_s9smk0_ELOImpl.invokeOperation(ServerWrapper_s9smk0_ELOImpl.java:63)	at com.bea.dsp.ws.RoutingHandler$PriviledgedRunner.run(RoutingHandler.java:96)	at com.bea.dsp.ws.RoutingHandler.handleResponse(RoutingHandler.java:217)	at weblogic.wsee.handler.HandlerIterator.handleResponse(HandlerIterator.java:287)	at weblogic.wsee.handler.HandlerIterator.handleResponse(HandlerIterator.java:271)	at weblogic.wsee.ws.dispatch.server.ServerDispatcher.dispatch(ServerDispatcher.java:176)	at weblogic.wsee.ws.WsSkel.invoke(WsSkel.java:80)	at weblogic.wsee.server.servlet.SoapProcessor.handlePost(SoapProcessor.java:66)	at weblogic.wsee.server.servlet.SoapProcessor.process(SoapProcessor.java:44)	at weblogic.wsee.server.servlet.BaseWSServlet$AuthorizedInvoke.run(BaseWSServlet.java:285)	at weblogic.wsee.server.servlet.BaseWSServlet.service(BaseWSServlet.java:169)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)	at weblogic.servlet.internal.StubSecurityHelper$ServletServiceAction.run(StubSecurityHelper.java:227)	at weblogic.servlet.internal.StubSecurityHelper.invokeServlet(StubSecurityHelper.java:125)	at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:292)	at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:175)	at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:3498)	at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:321)	at weblogic.security.service.SecurityManager.runAs(Unknown Source)	at weblogic.servlet.internal.WebAppServletContext.securedExecute(WebAppServletContext.java:2180)	at weblogic.servlet.internal.WebAppServletContext.execute(WebAppServletContext.java:2086)	at weblogic.servlet.internal.ServletRequestImpl.run(ServletRequestImpl.java:1406)	at weblogic.work.ExecuteThread.execute(ExecuteThread.java:201)	at weblogic.work.ExecuteThread.run(ExecuteThread.java:173)