Wise SOAPClient action is unable to invoke oneway methods (methods annotated with javax.jws.Oneway annotation) on WS endpoints. It looks like webservice WSDL is parsed correctly, but after that no statements from oneway method body are executed. We tested this with very simple webservice (see attached file) containing one oneway method with System.out.println() statement. After WSDL was parsed, there was no further output from webservice method.
Invocation of twoway methods on WS endpoint is working correctly (without any problems/exceptions and with expected results).