Dmitry,

>Open Database MyDatabase
>Set database to MyDatabase
>Modify Database
>-. This opens all tables of in the database in the Database Designer window.
>Then I try to Right click but the menu does not have an item Edit Referential Integrity.
>
>Could you please point me to what I am missing?

vfp RI was wordy at least, not errorfree in the wizard interface in earlier versions (dunno about vfp9).
Most people went with other tools. One of the cleanest implementations
(done totally via SQL - think portability!!) is in the Booth/Sawyer book.
Sawyer enhanced it even further and put it on his site - google for it or ask Naomi.
I remember discussing some fine points in that code with her.

Another solid one is Markus Winhard's AMRI.
Or check out Rick Schummer's site: He either has a RI tool or will point you to one.

regards

thomas