"Saving changes is not permitted" - error when trying to save SQL changes

When I tried to save the table changes done using SQL Server R2, I got the below error all the time.

The problem was solved after the doing following changes.

To change the Prevent saving changes that require the table re-creation option, follow these steps:

1. Open SQL Server Management Studio (SSMS).
2. On the Tools menu, click Options.
3. In the navigation pane of the Options window, click Designers.
4. Select or clear the Prevent saving changes that require the table re-creation check box, and then click OK.

Note If you disable this option, you are not warned when you save the table that the changes that you made have changed the metadata structure of the table. In this case, data loss may occur when you save the table.

For more Info: http://support.microsoft.com/kb/956176