You should give the 2nd part of XML Stream rule as response in Service-SOAP rule.
XML Stream Enter either the Stream Name — second key part — of the appropriate XML Stream rule or a page name and stream name using the syntax PageName.StreamName. (The page must be on the clipboard when the service rule runs for rule resolution to find the rule.) If you specify the stream name only, the system uses the Page Class of this service rule (on the Service tab) as the first key part of the HTML rule.
Note: To reference an XML Stream rule, the following conditions must be met:
The Applies to class of the XML Stream rule must match the Primary Page class.
The Stream Name key value must match the Map From Key value on the service rule form.
The XML Type key of the XML Stream rule must be the constant value MapFrom. If the generated XML Stream rule does not contain this key, resave it and specify the new XML Type Key.