“Save changes is not permitted” when changing an existing column to be nullable

Question

I\'ve got a SQL Database Table, which has 35 existing records. One of the fields in this table is called Name, nvarchar(100), not null

Answer 1

I had the same problem; wanting to Allow Nulls for a column that previously did not. Consider MS's warning to NOT turn off this option: http://support.microsoft.com/kb/956176

And their recommendation to use Transact-SQL to solve the problem, e.g. alter table MyTable alter column MyDate7 datetime NULL

This solved it for me.