I just found out a great portal about xml digital signature xades standard testing tool, with detailed information on what is wrong. You just need to send a free email to get the login credentials and you are good to go. They replied to me the next day.
The link is located at ETSI site: http://xades-portal.etsi.org/pub/index.shtml
There is a link (lower left part) to the Xades baseline checker online tool which is the final target:http://212.234.160.9/pub/index.shtml. I hope the ip doesn’t change.
Have fun!