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:

which steps i have to take ?