I'm trying to create validation errors displaying directly in the wizard window, and for this I need to update field values on the client side, to send records id which causes the validation error to m2m field. 
The problem is I can't just update wizard model m2m field with that values, it doesn't save value of that field and doesn't send it to opened wizard view on client side.
Is it possible at all? Any tricks or something will help me.
Thanks.