ServiceNow dashboard filter dependency (cascading filters) for cmdb

[Luis33]

In the context of my PDI instance, I am trying to establish a relationship between two filters. My first filter named "Service Instance" pulls the "Configuration Items" values from the Configuration Item table (cmdb_ci) to be applied to Incident.Configuration item (data to filter).

My second filter named "Business Service" pulls the "Service" values from the Service table (cmdb_ci_service) to be applied to Incident.Service (data to filter). However, in this latter filter under the section "Follow other filter/Filters with table connections", I am not able to see the option "Follow Service Instance".

It is known that there is an intermediate table called "cmdb_rel_ci" between "cmdb_ci_service" and "cmdb_ci". 

My inquiry is whether someone has also encountered this particular situation, and therefore,

1) what tables were used instead

2) what steps were taken from the admin perspective to make the follow other filter option available.

Thanks