We're considering utilizing an ETI (Electronic Transaction Identifier) to distinguish transactions originated from a Third Party Sender (TPS).

Can someone elaborate on the ETI for me? I'm curious as to how Origination trace numbers will look like (with the ETI or with our ABA). Also curious about how the Returns will come back (with ETI or our ABA). I know our ABA will handle all Settlement, but I'm looking for file/item identification methods.

Thank you in advance.