>i have a table with unique index. and some records
>
>key recno
>---- -----
>1 10
>1 11
>1 12
>2 13
>
>index on key tag key unique for !deleted()
>
>set orde to key, and listed:
>
>key recno
>---- -----
>1 10
>2 13
>
>if i delete record 10, record 11 or record 12 doesn't appear. but i created unique index with deleted() keyword. i think if i delete record 10 must appear another record has key 1.

That's the way unique index works. It's better not to use unique index at all.