Incorrect UPDATE SQL being generated by DataContext

[Table(Name="TestTable")]
public class TestObject
{
private string _description=string.Empty;

[Column(Name="TestDescription", Storage="_description")]
public string Description
{
get
{
return _description;
}
set
{
_description=value;
}
}
}

DataContext context=new DataContext(connection);
Table<TestObject> table=context.GetTable<TestObject>();

TestObject obj=Sequence.First<TestObject>(table);
obj.Description="Description Changed";

context.SubmitChanges(); // Get error here - update statement has UPDATE TestTable SET Description= ...

// Should be UPDATE TestTable SET TestDescription = ...

[951 byte] By [JamesLett] at [2008-3-7]