Error validating the formula for column. (Visual Database Tools)
SQL Server 2005
The formula contains an error. Common errors include mismatched parentheses, misspelled column names, and using an operator on a column whose data type does not support that operator. Choose Yes to modify the formula. Choose No to leave it as is.
For more information about formulas, see your database documentation.
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Expressions (Database Engine)Expressions (Transact-SQL)