Richard,
In order to clean up a database, the database must be opened exclusively:

OPEN DATA < YourDbc > EXCL
MODI DATA
*-- select Clean Up Database from the Database menu
*-- now you should be able to use the RI builder

HTH
>Hallo All,
> How come when I try to edit the Referential Integrity I get an error that
> "The Referential Integrity builder cannot run because the database has not been cleaned up."
>
>I've tried closing all tables and settting exclusive on but still I get the error. The Clean Database is not highlighted so I cannot clean the database.
>
>Does anyone know how I can edit the Referential Integrity? I would be glad for all the help that I can get.
>
>Thanks in advance.
>
>Richard.