If the database is already open, and you issue that command to open it exclusively, VFP does NOT close the DBC first before re-opening it exclusively like it would a table. You have to make sure the DBC is closed before reopening it exclusively.

RELEASE ALL
CLEAR ALL
CLOSE ALL
OPEN DATABASE...

>Unfortunately I am still not done with RI.
>First of all, for some reason, when I open my database with
>

>OPEN DATABASE ecamat.dbc EXCLUSIVE
>MODIFY DATABASE
>

>The "cleanup database" menu item is still not active, and the "edit referential integrity" item answers that the current dbc is not open in exclusive mode. Any idea about what I am doing wrong ?
>Then, I can't find the TaxRI builder on the UT downloads, and not with a Google search either.