The Sniffer also attempts to extract the name of the web service from the SOAP message’s SOAPAction HTTP header tag. As of SOAP v.1.2, however, the 
SOAPAction tag is no longer mandatory. When this tag is missing from a SOAP message, the resulting hit includes the SOAP operation, but does not include the web service to which the operation belongs. You can remedy this situation by using the Web Services dashboard to specify how SOAP operations map to web services.