Description of problem:
"Subscription - Entitlement Report" in Satellite 6.11.4 generates bogus numbers for columns "Subscription Quantity" and "Subscriptions consumed".

Version-Release number of selected component (if applicable):
Satellite 6.11.4

How reproducible:
The issue is seen only on Sat6.11 and it is not reproducible on Sat6.12.

Steps to Reproduce:
1. Attach different amounts of multiple Red Hat and custom subscriptions to a host
2. Generate a report from Monitor -> Report Templats -> "Subscription - Entitlement Report" -> Generate
3. Compare values in columns "Subscription Quantity" and "Subscriptions Consumed" with actual number of subscriptions attached to host

Actual results:
Numbers don't match

Expected results:
Numbers should match

Additional info:
'Subscription type': STACK_DERIVED subscriptions show -1 value for 'subscription quantity'