Have you encountered an error while making changes to your Database tables that says: 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. Figure 1 The error message is giving us clues on how to solve this with the last statement "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 ." Based on my experience, the problem is that the " Prevent saving changes that require table re-creation " is checked. (Look at the figure below.. Figure 2 In order for you to save these kind of changes, you have to uncheck it by going to Tools>Options .. Figure 3 Then look for " Designers " at the left and click on the