sharepoint webrefences

sharepoint webrefences

  
i like to retrieve listItems from sharepoint services 3.0

what i did

outsystem 5.1

webreference  Format:HTML http://sql_nl/_vti_bin/lists.asmx?wsdl


installed extendedwebrefenced

set webreferencecredentials  to put my cred

filled in the guid and and the queryoptions

result is: The request failed with HTTP status 401: Unauthorized.

and in service manager: http://www.outsystems.com/help/servicestudio/5.1/default.htm#Errors_and_warnings/Web_Reference_Integrity_Warning.htm

which steps i have to take ?