Right on resources allocation

I defined a profile who is a team leader, not a projet leader. This profile can only allocate resource on activity/project already definded by a project leader. However, for allowing this user to create allocation on project/activity, I have to :
- Define a specific access mode with view and update capability (on his affected project)
- Define in data access (project dependent), this specific access mode for project/activity/milestone.

The problem that user can also update all the other part of the project/activity/milestone -> that's wrong, only ressource allocation have to be open.

If I delete the data acces on project/activity/milestone, the user can't update project/activity/milestone. allocation include.
However, the user has right on Allocation menu (in environment param) work well in this context.... for project scope only.

I think, you have to add allocation right check on project/activity/milestone detail part. Even if project/activity/milestone update is forbidden, if allocation is allowed, this part have to be active for the user

Ok, but, if it's not a bug WHY?
Why I can define a resource allocation on Project in menu "Allocation" and I can't do the exact same thing (allocate resource on project) on project detail page?
The consistency is strange....

So, thanks for your answer, I have to find another way to work....