" =currentuser() " as a default promt value

hello gurus,

Due to the database model and security i am working, I have to create a default prompt in a web I report which picks the Current user login ID in Infoview as default value and runs the report.

I tried using "=currentuser() " syntax in prompt value , it doesnt worked.

can we create formulae Promts which picks the va

I cant do this at Universe Level, as we dont have SSO enabled and the connection may be on different ID.

is there any possibility for my requirement. any alterations to SQL?

Please help me in this regards, or any work arounds.

Thanks

Prashanth