Why do I get "Could not find service named null in wsdl" exception while using @WebServiceRef and trying to use an EJB as WebServiceClient ?

Issue

• We are using @WebServiceRef and trying to use an EJB as WebServiceClient and get the following Exception:

Caused by: javax.xml.ws.WebServiceException: Could not find service named null in wsdl file:/path-to-wsdl/META-INF/WSProvider.wsdl
    at org.apache.cxf.jaxws.ServiceImpl.initializePorts(ServiceImpl.java:160)
    at org.apache.cxf.jaxws.ServiceImpl.<init>(ServiceImpl.java:148)
    at org.jboss.wsf.stack.cxf.client.ProviderImpl.createServiceDelegate(ProviderImpl.java:141)