Project Billing / AR electronic invoicing

I am curious what you have done to streamline where certain customer required fields go, such as:

AFE#

PO#

GL Code#

Customer Project

What I am finding is our business units do all of their billing through Projects Billing and everyone puts customer references in different places. It doesn't matter now since they manually re-key into customers invoicing portal, but now that we are automating, it is creating a nightmare for coding.

If Business Unit 1 and Customer = abc company, search for AFE in Project Description

If Business Unit 2 and Customer = efg company, search for AFE in Project Task

I know most of this is business process definition but I'm curious what you have done in EBS on AR or PA side to accomodate this.