Calling a CAF program via web service generates QName cannot be null error, but only for 1/5 of the same call in a parallel for loop.

I'm calling 5 identical web service calls using a parallel for loop in BPM. Obviously the data in each slightly differs. Why would this call suspend the process and give the following errors:
handleCommunicationError( ErrorContextData, Throwable, TransitionTicket ): A technical error occurred.
Interface namespace = myNamespace
Interface name = myService
Operation name = myOperation
Connectivity type = WS
Application name = myAppName
Reference name = 8bd95deb-8cf1-453d-94e5-0576bb385149
Message Id = null
WS style = DOC
Start time of WS call = 2014-02-26 17:51:23.297
Return time of WS call = 2014-02-26 17:51:23.412
Principal name = SAP_BPM_Service
Root error message = local part cannot be "null" when creating a QName
Error message = Could not invoke service reference name 8bd95deb-8cf1-453d-94e5-0576bb385149, component name myComp application name myappname
com.sap.engine.interfaces.sca.exception.SCADASException: Could not invoke service reference name 8bd95deb-8cf1-453d-94e5-0576bb385149, component name
myCompname
at com.sap.engine.services.sca.das.SCADASImpl.invokeReference(SCADASImpl.java:341)
at com.sap.glx.adapter.app.ucon.SCADASWrapperImpl.invoke(SCADASWrapperImpl.java:101)
at com.sap.glx.adapter.app.ucon.UnifiedWebServiceCallObject.invokeWebServiceOperation(UnifiedWebServiceCallObject.java:101)
at com.sap.glx.adapter.app.ucon.UnifiedWebServiceCallClass.invoke(UnifiedWebServiceCallClass.java:178)
at com.sap.glx.core.dock.impl.DockObjectImpl.invokeMethod(DockObjectImpl.java:657)
at com.sap.glx.core.kernel.trigger.config.Script$MethodInvocation.execute(Script.java:248)
at com.sap.glx.core.kernel.trigger.config.Script.execute(Script.java:798)
at com.sap.glx.core.kernel.execution.transition.ScriptTransition.execute(ScriptTransition.java:78)
at com.sap.glx.core.kernel.execution.transition.Transition.commence(Transition.java:196)
at com.sap.glx.core.kernel.execution.LeaderWorkerPool$Follower.run(LeaderWorkerPool.java:163)
at com.sap.glx.core.resource.impl.common.WorkWrapper.run(WorkWrapper.java:58)
at com.sap.glx.core.resource.impl.j2ee.J2EEResourceImpl$Sessionizer.run(J2EEResourceImpl.java:261)
at com.sap.glx.core.resource.impl.j2ee.ServiceUserManager$ServiceUserImpersonator$1.run(ServiceUserManager.java:152)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Subject.java:337)
at com.sap.glx.core.resource.impl.j2ee.ServiceUserManager$ServiceUserImpersonator.run(ServiceUserManager.java:149)
at com.sap.engine.core.thread.impl3.ActionObject.run(ActionObject.java:37)
at java.security.AccessController.doPrivileged(Native Method)
at com.sap.engine.core.thread.impl3.SingleThread.execute(SingleThread.java:185)
at com.sap.engine.core.thread.impl3.SingleThread.run(SingleThread.java:302)
Caused by: java.lang.IllegalArgumentException: Could not process message for operation myOperation in web service plugin module.
at com.sap.engine.services.sca.plugins.ws.WebServiceImplementationInstance.accept(WebServiceImplementationInstance.java:228)
at com.sap.engine.services.sca.das.SCADASImpl.invokeReference(SCADASImpl.java:314)
... 19 more
Caused by: java.lang.IllegalArgumentException: local part cannot be "null" when creating a QName
at javax.xml.namespace.QName.<init>(QName.java:246)
at javax.xml.namespace.QName.<init>(QName.java:190)
at com.sap.engine.services.webservices.espbase.client.dynamic.impl.DInterfaceImpl.getInterfaceInvoker(DInterfaceImpl.java:126)
at com.sap.engine.services.webservices.espbase.wsdas.impl.WSDASImpl.<init>(WSDASImpl.java:43)
at com.sap.engine.services.webservices.espbase.wsdas.impl.WSDASFactoryImpl.createWSDAS(WSDASFactoryImpl.java:39)
at com.sap.engine.services.sca.plugins.ws.tools.wsdas.WsdasFactoryWrapper.createWsdas(WsdasFactoryWrapper.java:30)
at com.sap.engine.services.sca.plugins.ws.WebServiceImplementationInstance.initWsdas(WebServiceImplementationInstance.java:256)
at com.sap.
Surely if it was the service group unassign then reassign issue then none of the calls would have worked?

Hi David,
While a random error is still an error it will be difficult for support to find a problem for an error which is not reproducible. It is always a faster resolution if you can determine how to provoke the error and provide those details. If we can reproduce an error on internal systems then we can fix the problem quickly and without having to access your system.
regards, Nick

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points will be rewarded

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