CA Service Management

I am trying to see where in SQL the custom Property Values (under the Properties tab) and their responses are linked to the Call Request record. I see in the schema the different fields that identify where they are created and acceptable values; however, I don't see where they are linked to the Request/Incident in the database. Can someone help?

The table for properties is cr_prp and the linking attribute is owning_cr back to the persid attribute of the call_req table.