Statistics for Subdomains (Plesk CP 9.2)

[AlvaroT]

When I try to activate statistics for a subdomain (AWstats or Webvalizer), the combo-box is disabled and its shows a message like this: Plesk Control Panel doesn't support statistiscs for subdomains, you have to adquire a commercial statistic solution.

What kind of "commercial statistics" software have i to adquire? Or is that a bug?? (We use Webalizer and AWstats for the Domains ans they arre working correctly).