Error in importing certificate into the BW System

Hi,

I am trying to import the certificate from portal to BW system trough the STRUSTSSO2 transaction it is importing the certificate no issues in that but when i tried to add in the certificate list by using the "Add to certificate list" button i am grtting the error "error occured during import"

plz any one can give input in this.

This is very urgen...i will award the points for useful solution...

eagerly looking for the reply from u

Thanks

ajay