SSO issue in portal and BW report resources

Hi

I have a BW reports displayed in portal. user mapping is configured in such a way thta multiple users in portal are mapped with single user of BW system.

When BW report is displayed on portal, some of resources ( like images and js files as i see in http watch) are not fetched with reports and for those we need to login again as BW user.

i checked SSO configuration between portal and BW, it seems to be correct as data is displayed in BW report.

could you please suggest the solution of getting it fixed?

Thanks in advance

Pranav