Add user via Process REST API

Hi,
I have been working with the process rest api and I see that I can add users doing a post request to members collections, but seems that it only works if I am a administrator in the project area no matter if I have JazzAdmin repository permission,  I don't know why this happens, I got this error when I'm trying to do it.

Name: Save Project Area
    ID: com.ibm.team.process.server.saveProjectArea
    Severity: ERROR
        Summary: Permission Denied
        Description: You don't have permission to perform the following actions:
  Modify the collection of team members (modify/members)
        Severity: ERROR

As JazzAdmin user I can add users via web in all project areas even if I'm not the administrator of them.
Does anybody knows if there is another way to add the user using the process api without been an administrator of the project area?

I will give you an example of what I'm doing.

curl -k -b cookie.txt -c cookie.txt https://myserver/jts/authenticated/identity
    

curl -X POST --anyauth -k -L -b cookie.txt -c cookie.txt -d "j_username=myuser" -d "j_password=$pass" https://myserver/jts/authenticated/j_security_check
    

curl -D - -k -b cookie.txt -H "Content-Type: application/xml" -X POST --data-binary @user.xml https://myserver/ccm/process/project-areas/_m8GiUJyaEeCCOpmJEcOfKQ/members
    

my user.xml looks like this:

<?xml version="1.0" encoding="UTF-8"?>
    

          <jp06:members xmlns:jp06="http://jazz.net/xmlns/prod/jazz/process/0.6/">
    

            <jp06:member>
    

        <jp06:user-url>https://myserver/jts/users/anyuser@domain.com</jp06:user-url>
    

        <jp06:role-assignments>
    

<jp06:role-assignment>
    

        <jp06:role-url>https://myserver/rm/process/project-areas/_ObqWkrxQEeCyof5XwVHN7A/roles/Administrator</jp06:role-url>
    

            </jp06:role-assignment>
    

<jp06:role-assignment>
    

        <jp06:role-url>https://myserver/rm/process/project-areas/_ObqWkrxQEeCyof5XwVHN7A/roles/Author</jp06:role-url>
    

            </jp06:role-assignment>
    

<jp06:role-assignment>
    

        <jp06:role-url>https://myserver/rm/process/project-areas/_ObqWkrxQEeCyof5XwVHN7A/roles/Commenter</jp06:role-url>
    

            </jp06:role-assignment>
    

<jp06:role-assignment>
    

        <jp06:role-url>https://myserver/rm/process/project-areas/_ObqWkrxQEeCyof5XwVHN7A/roles/ProjectSnapshotAdministrator</jp06:role-url>
    

            </jp06:role-assignment>
    

<jp06:role-assignment>
    

        <jp06:role-url>https://myserver/rm/process/project-areas/_ObqWkrxQEeCyof5XwVHN7A/roles/default</jp06:role-url>
    

            </jp06:role-assignment>
    

       </jp06:role-assignments>
    

      </jp06:member>
    

         </jp06:members>
    

Thank you.