saving it is not permitted because the changes you have made require the listed tables to be dropped and re-created.

Problem: Saving always warns you that it is not permitted because the changes you have made require the listed tables to be dropped and re-created.

Solution: In SQL Management menu go to Tools menu, click Options, expand Designers, and then click Table and Database Designers. Select or clear the Prevent saving changes that require the table to be re-created check box.

Cheers!