Migrating DB

Hi,
i’m trying to migrate an existing DB that could be adapted to SPIP structure, then i first create sections from another DB (insert into rubriques (...) select ... from another_db ...) and so on, then i insert some articles taking care to associate with the section, and associate with an autor, and those things.

Then i’m able to see them on private area but when i try to see on public area i get a 404 error, then i forced to show the article doing ?article5 and i get the same error 404.

BTW I’m using SPIP 2.1. Any kind of help will be welcomed !