Web service unauthorized 401

Hi,
I have created a web service from a simple helloworld function module in Netweaver 7.0.
I created the service definition with basic authentification (User/pwd) security.
Now , my user has roles SAP_BC_WEBSERVICE_CONSUMER and SAP_BC_WEBSERVICE_ADMIN_TEC but  I still get a 401 unauthorized error when I run from Stylus Studio...
How can I see what authorizations I am missing... if I'm running in SRT , I can't run su53 after ????
How do you debug security for web services ???
Thanks

Hi,
thanks for the answer... I've already assigned roles and am wondering what is now missing... but also think it may be another problem.
does anyone know how to debug the security for web applications... in particular the soap run time (srt).
Normaly, in SAPGUI , you do SU53 after you get authorisation error... can't do this in the web.
Thanks.

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