"upgrade model from database" in Entity Framework designer doesn't update nullable for column

I created an edmx from a database. A column had NOT Null property. The I changed it to allowing nulls. Every time I select "upgrade model from database.." in the edmx designer, the nullable property for that column always stays as false. I have to change it manually.

Is this a bug in the designer in开发者_运维问答 VS 2010?

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Yes, it is a bug. See this bug report plus answer on social.msdn

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Delete the table in edmx-designer, and add it again in "Update model from database".