Dircat & Alternate Names

Hello.I use Domino server 6.5.3 (English) and Notes client 6.5.3 (English).

I create Extended Directory Catalog (include fields AltFullName & AltFullNameLanguage).

All users records have Russian alternate names.

When I create new memo in my mail box I write in address field first letters of Alternate Name of user, but when I press “Enter” address not found.

What is the matter?

Thanks.