Check your older thread on this topic Failed to enable constraints Thread #1495470 Message #1495470
May be it will help.

>To be honest, I don't know and don't know where to look or how to check. All the data set stuff is hidden by the Mere Mortals framework, I just tell it what stored procedure to run and it creates the dataset.
>
>>Does your DataSet has properly defined Primary Key?
>>
>>Also, I believe we discussed this exact error about a month or so ago with you before.
>>