Not A Valid Port Error when Sending to BPEL: javax.xml.ws.WebServiceException: {http://xmlns.oracle.com/OtmVoucherToOracleApInvoice=null}process is not a valid port. Valid ports are: (Doc ID 1323557.1)

Symptoms

When setting up more than 1 webservice/external system to send to BPEL, the following error is received on the one 2nd to be used:

ERROR
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Exception: Error Invoking Web Service Dispatch

javax.xml.ws.WebServiceException: {http://xmlns.oracle.com/OtmVoucherToOracleApInvoice=null}process is not a valid port. Valid ports are: {http://xmlns.oracle.com/apps/wsh/inbound/WshReceivePShipmentFromOtm=null}process

javax.xml.ws.WebServiceException: {http://xmlns.oracle.com/OtmVoucherToOracleApInvoice}process is not a valid port. Valid ports are: {http://xmlns.oracle.com/apps/wsh/inbound/WshReceivePShipmentFromOtm}process
at com.sun.xml.ws.client.WSServiceDelegate.safeGetPort(WSServiceDelegate.java:437)
at com.sun.xml.ws.client.WSServiceDelegate.createDispatch(WSServiceDelegate.java:407)
at weblogic.wsee.jaxws.spi.WLSProvider$ServiceDelegate.internalCreateDispatch(WLSProvider.java:671)
at weblogic.wsee.jaxws.spi.WLSProvider$ServiceDelegate$DispatchClientInstanceFactory.createClientInstance(WLSProvider.java:938)
at weblogic.wsee.jaxws.spi.ClientInstancePool.takeSimpleClientInstance(ClientInstancePool.java:621)
at weblogic.wsee.jaxws.spi.ClientInstancePool.take(ClientInstancePool.java:486)
at weblogic.wsee.jaxws.spi.WLSProvider$ServiceDelegate.createDispatch(WLSProvider.java:595)
at weblogic.wsee.jaxws.spi.WLSProvider$ServiceDelegate.createDispatch(WLSProvider.java:551)
at com.sun.xml.ws.client.WSServiceDelegate.createDispatch(WSServiceDelegate.java:420)
at com.sun.xml.ws.client.WSServiceDelegate.createDispatch(WSServiceDelegate.java:402)
at javax.xml.ws.Service.createDispatch(Service.java:325)
at glog.server.webservice.jws.WebServiceDispatch.invoke(WebServiceDispatch.java:46)
at glog.server.webservice.WebServiceCall.call(WebServiceCall.java:158)
at glog.server.webservice.WebServiceCall.call(WebServiceCall.java:108)
at glog.server.workflow.webservice.ServiceTransmission.execute(ServiceTransmission.java:166)
at glog.server.workflow.webservice.ServiceCall.executeWithReturn(ServiceCall.java:31)
at glog.server.workflow.webservice.ServiceCallTopic.execute(ServiceCallTopic.java:19)
at glog.server.workflow.SimpleWorkflow.execute(SimpleWorkflow.java:23)
at glog.server.workflow.WorkflowSessionBean.execute(WorkflowSessionBean.java:64)
at glog.server.workflow.WorkflowSessionNonTransServerSideEJBWrapper.execute(WorkflowSessionNonTransServerSideEJBWrapper.java:38)
at glog.server.workflow.WorkflowSessionNonTransServerSideEJBWrapper_t6tuwu_EOImpl.execute(WorkflowSessionNonTransServerSideEJBWrapper_t6tuwu_EOImpl.java:278)
at glog.server.workflow.WorkflowManager.execute(WorkflowManager.java:352)
at glog.server.workflow.Trigger.trigger(Trigger.java:122)
at glog.util.event.MemoryEventQueueRunnable.processEvent(MemoryEventQueueRunnable.java:146)
at glog.util.event.MemoryEventQueueRunnable.run(MemoryEventQueueRunnable.java:98)
at glog.util.event.EventThread.run(EventThread.java:82)
at java.lang.Thread.run(Thread.java:619)
transport - Services - 2

STEPS
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The issue can be reproduced at will with the following steps:

1. Setup 2 webservices - 1 for shipments and one for vouchers. (Soap action used in this case is process for both)
2. Attach one of these to each external system.
3. Send an outbound feed using a shipment.
4. Note Feed is successfully processed.
5. Send an outbound feed using a voucher.
6. Note error received in logs.

javax.xml.ws.WebServiceException: {http://xmlns.oracle.com/OtmVoucherToOracleApInvoice=null}process is not a valid port. Valid ports are: {http://xmlns.oracle.com/apps/wsh/inbound/WshReceivePShipmentFromOtm=null}process

Cause

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