This message has the following cause and solution:
This message is displayed whenever you use the Undo Check Out command on the Data and Misc. objects.
It is not possible for the source code control provider to determine whether the Data and Misc. objects have actually changed, so this warning is provided to remind you to save any changes you want to keep.
Click Yes if you want to replace your local Data and Misc. object with the latest version from the source code control provider, or click No to leave the local version in place and checked out.