Only subscribtion owner can view website statistics

Hello everybody... first post here, nice to meet you all!

I'm setting up two Plesk (12.5.30#40) instances under Centos 7.2 (comiing from cPanel, btw).

I have several issues, but one is becoming a real pain in the neck:

For a domain I have two Plesk users:

• Domain owner (unix user xxx)
  
• Webmaster

Webmaster has the following permissions:

• Create and manage databases
• View statistics
• Upload and manage files
• Create and manage mail accounts...

Only subscribtion owner can view website statistics