That did it. Thank you very much. I can now use drag and drop to define table relationships.

The Edit Referential Integrity menu option does not become enabled until there is at least one relationship defined.

>Dennis,
>
>This is a guess...have you tried:
>
>

>open data mydata exclusive
>validate database recover
>

>
>>Leland
>>
>>It must have something to do with the way I created the my Database. I opened the NorthWind database and Referential Integrity works OK. But, if I open my Database and modify it Referential Integrity is disabled.
>>
>>