>The field it's complaining about is calculated from a UDF call on the SQL server side. This seemed to work OK until I upgraded to the latest beta (but I have also made some other changes, so it's probably something I have done and not MM). The code to generate the DataSet is found in a parent class of the business object. I don't think that should be a problem.
>
>I'm not trying to update any data in the DataTable or the DataSet.

Are you keeping your DataSet around and reusing it?

Regards,