If you have a self-billing agreement in place between you and a supplier, they do not invoice you in order for you to pay them; on Etz the system will create a self-billing purchase invoice for you to issue to the supplier and export out to your accounts system (this takes the place of the invoice they would have issued to you).
The benefit of this process is two-fold; the supplier only needs submit a timesheet and once validated you have all you need to pay them and this process is much more efficient for you too as you no longer need to wait to receive an invoice from the supplier and reconcile it with the timesheet(s) before you can pay.
With the more traditional purchase-invoicing arrangement, suppliers must issue you with their purchase invoice before you can pay them. There is no facility within Etz for them to upload a Purchase Invoice with their timesheet, therefore they must email or post it to you.
It is then a case of reconciling that document with the timesheet information you have validated for that supplier, to check their invoice is correct, then those details are entered onto the system and a Purchase Invoice Remittance document is created on Etz. This document acts as a remittance advice for the supplier plus it represents the Purchase Invoice you have received from the Supplier, and this document is exported out to your accounts system.
For more information on how these two options work, please refer to the related articles: