Rational Report Studio/Cognos: Show all Collections with their requirements and their requests

I try to show all Collections with their requirements and their requests?

I tried the following:

Operational Data Store -> Requirement Area

Query1: Requirement Collection (1) + Requirement Collection Related Requirements (2)

Query2: Requirement Collection Related Requirements (2) + Requirement Related Requests (3)

Join Query1 and Query2 over:

Reference ID from Requirement Collection Related Requirements (2) =

Reference ID from Requirement Collection Related Requirements (2)

Problem: Entrys from Requirement Collection Related Requirements (2) which has no Entry in Requirement Related Requests (3) are not shown.

I tried to set it through the cardinality (0...n) but this seems to have no effect.

Do somebody know what I'm doing wrong?

Or is there a smarter way to show all Collections with their requirement and their requests?

Thank you in advance.

Alex