Thank you very much Geoffrey for your advice,

Got another different problem now: The Object Datasources just disappear from my Visual Studio 2008 when opening a report. Do you know how can I get it back? last time I had to format my machine and got it for some months until yesterday that I had the same problem. Now I just have formatted it again, but this time, on my second time I edited my project, it just vanished again... this is making me crazy...

Thanks,

Marco