The Allow Nulls property can't be set on a column that is part of the primary key. (Visual Database Tools)
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The Allow Nulls property can't be set on a column that is part of the primary key. (Visual Database Tools)

All columns that are part of a table's a primary key must contain aggregate unique values other than NULL. To add the column to a primary key, first clear the Allow Nulls check box on the Column Property dialog box.

For more information, see How to: Modify Null Options on Columns (Visual Database Tools).

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