>I am trying to set up referential integrity in a database. When I try to enter that area I get a message "Clean up Database by selecting clean up database in database menu"...problem is that menu option "clean up database" is disabled. Any help would be greatly appreciated.I have tried several different approaches nothing is working. Thanks,

"Clean up database" requires that database was open exclusively. If database's open, close it first and than open with EXCLUSIVE clause.