Comments set id

[blacksrv]

Hi, it's possible to set the id of a comment?? I'm using:

$c = new Comment();
$c->id = $post['id'];

but it's not working.

I'm importing comments and I need to set the id to add comments replies.

Thanks

EDIT: Definitely is not working, I tried to create a new comment with id and it's not working. Any ideas?