porting vs 2003 w/ cr9 reports to vs 2005 and integrated cr10

i successfully converted a project but a lot of reports don't work in
vs2005. they come up with some kind of error regarding database -
parameter wasn't supplied, can't find database etc. these errors i think
come up only when reports use stored procedures with parameters.

i checked on breakpoints, parameters and correct connection info is sent
to report.
does anybody have some solution or workaround?

nedim