Profile Project Manager - by: VERGES

Hi,
I have a question about profiles management:
We have a user who have a default profile : "member of a team" on ProjeQtOr.
This user, ponctually, is assigned "Project Manager" on a project.
Being PM on the project this user should be have capability to access to the button "caculate automaticly the planning" on the "planning" view...

I don't understand that...

Thanks