Opendocument URL-How to change default authentication type?

Hi,

We are using opendoc url to access certain webi reports in SAP BO 4.0 SP4 environment.

When the end user opens the url they are asked for logon credentials, which is fine. However, the logon window does not give an option to change the authentication type. End users are using SAP login and the opendoc window is allowing to login with only enterprise user id as the drop down to select authentication type is not displayed.

Is there any way we can force the opendoc url to prompt the user to select authentication type or make the default authentication type as SAP authentication?

Regards,

Chetashri Vispute