Count software licenses

I want to count all the software licenses per program and make a report of it. What I already tried is make a report with the Data object 'Report Parts, Audit, Software Licenses'. Then I have the columns Product Name and Machine Name, the Aggregate of Machine Name is COUNT. But when I run the report I have many of the same programs with 1 license.

In example:

Windows XP Professional 1
Windows XP Professional 1
Windows XP Professional 1
Windows XP Professional 1

Instead of:

Any idea?