How to Pass Authentication Parameters to http basic authentication webservice

Hello Team,

I have a web service to which I need to pass the user Name Password for Authentication.

What I have tried so far. Testing thru Soap UI.

1: Pass User Name & Password on Soap Header :- Fails "HTTP ERROR: 401 Unauthorized"

2: Pass Username & password on URL : "Fails "HTTP ERROR: 401 Unauthorized"

3: User Name Password provided in Soap Request Properties. "AUT" Username & Password. : Works perfect comes back with Response.

4: Only "Authorization" added with the Value from previous test.you can see that on RAW Tab. Value ''Basic YWRxxW21YWRxxW5=" not no user name password sent . : Works perfect comes back with Response.

Now I am Trying to Figure out how do I send the User Name Password while invoking the Webservice from a Workflow in Siebel.