The problem was that I decided to add more tables to the dataset, so I deleted it and regenerated the dataset.
I noticed that the code related to the old dataset was not removed.
Everything worked fine now.
Thanks


>How about posting some code, Nabil. Maybe we can help figure it out that way ...
>
>~~Bonnie
>
>
>>I generated a dataset out of two related data adapters.
>>When I try to retrieve data, the following error occurs
>>"Failed to enable constraints. One or more rows contain values violating non-null, unique, or foreign key-constraints"
>>I am sure that the relation between the data adapters are properly established.
>>What Could Be The Reason?