I ran across an error in Management Studio:

“Saving changes is not permitted. The changes you have made require the following tables to be dropped and re-created. You have either made changes to a table that can’t be re-created or enabled the option Prevent saving changes that require the table to be re-created.”

To resolve the error, change a setting in Management Studio.

In SSMS, go to Tools => Options => Designers => Table and Database designers.
Make sure the option ‘Prevent Saving Changes That Require Table Re-creation’ is unchecked.