What are the URL's referring to? Are these WSDL URL or Web Service URL?
If you are migrating dashboards based on QAAWS from one environment to another, I would recommend you to use relative paths for web service URL. WIth this, it wont be necessary to modify the web service URL after migration, as the dashboard would pick the host name of the server where it is viewed.
Refer the below useful link:
http://wiki.scn.sap.com/wiki/display/BOBJ/How+to+Migrate+and+Upgrade+Dashboards
Regards,
Niraj