Dear Gabriele,
I come back to your classification problem. There are really a lot of misclassification issues with the Sen2Cor-version you are using. There is an update of scene classification module on the way with the next update of Sen2Cor. We are actually testing it in the S2-MPC and results are much better. However, don’t expect that scene classification is perfect.The problem that some bright roofs are classified as clouds is difficult to avoid. It wouldn’t be better when some thrsholds are changed and as a result some clouds are classified as roofs.
I have no information when the Sen2Cor update will be released to public.
Regards
Bringfried