When you install the Microsoft SQL Server Management Studio, the default settings do not allow you to save any changes to the structure of your tables that would cause the tables to be dropped and recreated, which can be extremely limiting when you are needing to make a quick change using the interface.

The good news is that it is very easy to change this setting by following these steps:

1. Open SQL Server Management Studio
2. From the file menu, choose Tools à Options
3. From the left menu, choose Designers
4. Uncheck the box entitled Prevent saving changes that require table re-creation
5. Press OK to save

SQL Server Error: Saving Changes is not permitted. The changes you have made require the following tables to be dropped and recreated