Yes, you understood perfectly. I would like him to have permission to add line ítems but I don´t like to have another person in the Project owner group.
Due to this I´ve trying the "active observers group" and the behaviour it´s the same like the Project owner so it´s perfect.
The problem is that this guy is an "internal user" so he hasn´t got User licence, and if he can edit like an "active observer group" may be he need a user licence, needn´t he?
Thank yo very much in advance.
Ana