What does the setting under the Admin --> Report Suites --> Conversion --> Unique Visitor Variable do?
I have read documentation on the same and it says is "The Unique Visitor Variable is used to designate which eVar will contain your visitor identifier. The Unique Visitor variable allows you to report on customer activity using your own unique identifier instead of Adobe's."
I am not sure what it means? does it mean setting this to a custom eVar will replace the ECID of that visitor with the custom variable?