Questions about the schema

Hi there,
i have the following schema for a cube called invoices: http://i.imgur.com/hsMNmEr.png .

The problem is:
for the dimension product I have a product family which is a hierarchy where:
* the first level is the family
* the second level is the group
* the third level is the sub-group
example: Hardware --> CPUs --> i7 Cpus . If I don't have any family the three codes are "N.A."

The problem is with Saiku:
If in my schema I have
- Family
- Group
- Sub-group
- Product code (where I have various codes...)

the family hierarchy is repeated for every code, even if the product code is not in the MDX query. Example:

Hardware --> CPUs --> i7 --> CPU0001
Hardware --> CPUs --> i7 --> CPU0002

but the code is not included in the analytics

Instead it should show only one time, and if i add the code should be repeated.

What am I missing?

thanks