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

Problem
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Message:
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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
The above dialog box appears in SQL Server 2008 Managemnet Studio (SSMS 2008) when you try and make changes to a table which reuire the table to be dropped and recreated internally.

Solution
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To get rid of the dialog box follow the below steps to change the SSMS 2008 setting:

On  the 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.

The above is shown the image below:

More Information
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The following actions might require a table to be re-created:

• Adding a new column to the middle of the table
• Dropping a column
• Changing column nullability
• Changing the order of the columns
• Changing the data type of a column

--Abhishek Soni