CI Relationships and Affected service

Hi Experts,

i am new at hp service manager and i need your help.

I trying to make relationships between Service, CI collection and CIs but i faced an issue.

The main relationships are like this: Servive -> (Downstream) CI Collection 1 -> (Downstream) CI Collection 2 -> (Downstream) CIs

When i try now to add affected ci at SD or IM, CI is not visible. I am able to add only CI Collection 1. 

What i am doing wrong? 

Thanks in advance,

Stelios