
In SAP MM, the purchase order and service entry sheets are created using the worklist for the invoice verification. There is also an option to do a self-billing (ERS).
The invoice verification is performed in SAP MM and can be done with reference to an SAP TM freight order, carrier, bill of lading, air waybill, flight number, or voyage number. If SAP MM successfully verifies the actual invoice against the expected invoice, SAP TM is notified by updating the freight settlement document (FSD) with the invoice ID and actual amounts. SAP TM updates the Life Cycle Status of the FSD to Invoice Verified. Once the FSD has reached this status, it is not possible to cancel the invoice.
In MM, for logistics invoice verification, internal documents such as a purchase order and a service entry sheet that the system requires for invoice creation are created based on TM data. When incoming invoices are entered or canceled, external TM is informed by enterprise service Supplier Invoice Notification (InvoiceNotification_Out). When working with TM as an internal component, the updates to the freight settlement document are done online.
When verifying invoices in MM, you can navigate to the TM freight order details by clicking on the Details for the invoice item.
Ready for Settlement

Once the settlement process is completed, the process for paying the carrier invoice can begin. Using transaction MIRO, the vendor invoice can be entered. However, if the evaluated receipt settlement (ERS) procedure is in place, this process occurs automatically.
For SAP TM-related invoices, there is a TM Reference tab in the MIRO transaction. To view this tab, you must set up the user parameter TM_INVOICE_CLERK in the user data. With the user parameter TM_INVOICE_CLERK, you control which tabs the user sees when entering or changing incoming invoices in the transaction. The user parameter can be set to Blank (where the user sees both the TM Reference and PO Reference tabs) or X (where the user sees the TM Reference tab only).
Financial Postings

When a payment is made, financial postings are carried out. These are the same postings that would be made for non-TM related invoices.
Evaluated Receipt Settlement (ERS)
Evaluated Receipt Settlement, also known as "self-billing" is the process of settling goods receipts directly without receiving an invoice from the carrier. The system can generate the corresponding invoices and post them. A carrier invoice is no longer required. You can execute the evaluated receipt settlement with reference to documents in Transportation Management.
If you have a long-term partnership with your carriers and the respective carrier executes many orders for your company with an outstanding performance, this process is a common practice to reduce the administrative effort regards financial settlement.
In the same way as when incoming invoices are entered, in evaluated receipt settlement TM is informed by an enterprise service (SupplierInvoiceNotification - InvoiceNotification_Out) when you use an external SAP TM system. When you use an internal TM system, the ERS process notifies the freight settlement document when the system creates an invoice online.
For using the self-billing scenario, the carrier business partner has to be enabled for ERS.

To check if the carrier is enabled, go to Transaction BP, choose your carrier and the role FLVN01 MM Vendor. In the header bar, click on Purchasing. In the Purchasing Data tab, check if the flag for ERS is set.
Note
In the same tab, section Additional Control Data, check that the flag "Auto GRSet. Ret." is set. This "Automatic evaluated receipt settlement for return items" flag enables the creation of the Credit Memo via the ERS process. If the carrier is ERS-enabled, a posted and invoiced FSD (lifecycle status "invoice verified") can be reversed via the "Reverse Document" action button directly in the FSD or in the worklist. A new SES with the returns indicator set will be created.
The ERS process and a variance called carrier invoice submission, can also be performed using the SAP Business Network for Logistics (SAP BN4L), which is a cloud-based carrier portal solution available with a separate licence.

