How exactly 'Impacted Services/CIs' related list works on Incident form?

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How exactly 'Impacted Services/CIs' related list works on Incident form?

I understand there are certain system properties based on which this gets controlled.

I also read on few posts that, with Service Mapping vs without Service mapping, the way Impacted services related list gets populated varies. but still I did not get clarity.

Whoever is aware of this topic, can you please share the details as to how exactly 'Impacted Services/CIs' related list works on Incident form (like from which table refers the data? what happens when multiple CIs are added in impacted CIs?) etc

NOTE - PLEASE dont give link to docs or other community posts. I have already gone through many and none of them provided concrete details.

PLEASE share the details if you are really clear on this topic 

THANKS a lott in advance!!!

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I have rel between a windows server and an application sercvice in cmdb cmdb_rel_ci. I clicked on  'refresh impacted services', nothing got populated.

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No one?

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Not a single person ?

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Anyone?