Database Changes Detected Dialog Box (Visual Database Tools)
Topic Status: Some information in this topic is preview and subject to change in future releases. Preview information describes new features or changes to existing features in Microsoft SQL Server 2016 Community Technology Preview 2 (CTP2).
This dialog appears if you attempt to save a database diagram or selected tables but some of the database objects that will be affected by the save action are out of date with the database. Accepting the changes shown in this dialog box updates the database to match your diagram and overwrites other users' changes.
Although you cannot undo changes made to a table or database diagram, the changes are not saved to the database until you save the table or diagram. You can discard any unsaved changes by choosing No and closing all open diagrams without saving them.