Question : sql server tables

I cant make changes to fields in my sql 2008 ex table.
How do I do thisas I get an error saying the option hasnt been checked.

is it too late to fix?

Answer : sql server tables

That is because the change you are doing requires rebuilding the table.  SQL Server 2008 by default does not allow that.  It order to enable that you have to check the box that reads:
Prevent saving changes that require table re-creation

You can find it by going to Tools | Options | Designers | Table and Database Designers