Bill Transaction Currency for Cost Based Revenue

Has anyone figured out what this setting does?

The way I READ the documentation is 1. If you check Invoice by bill Transaction currency then the bill transaction currency for cost based revenue will be what you select in this configuration.

This is not what is happening, furthermore; there is documentation indicating that the checking of "Invoice by Bill Transaction Currency" (Doc ID 1609747.1) is supposed to do following which it is doing.

Note: For any Invoice originated from events or expenditure items:

If "Invoice By Bill Transaction Currency" is enabled, then currency of invoices will be same as that of the events or expenditure items.