Hi Jamie,
In case of ERS invoices, suppliers do not need to send you supplier invoices; instead the system uses the prices in purchase orders and the quantities in goods and services receipts or inbound deliveries to create and post supplier invoices automatically on behalf of the suppliers. In supplier master, if you have marked for ERS check, system automatically assigns all purchase orders for that supplier to ERS.
In the Evaluated Receipt Settlements view of the Supplier Invoicing work center, you have to schedule a ERS run. In each ERS run, the system creates invoices for all purchase orders that are marked for ERS. Here system copies the invoicing data from the purchasing documents for which the invoice is required.
The system uses the prices in the relevant purchase orders and the quantities in the relevant goods and services receipts or inbound deliveries to create and post invoices on behalf of the suppliers. And system checks the supplier invoice for consistency and posts the invoice. Once invoice is posted, supplier is notified.
Note: Depending on the invoice format in which the supplier is to be notified, the system sends one of the following messages to the supplier's external invoicing system:
ERS invoice using SAP Electronic Data Exchange (EDX), sent in XML format
ERS invoice form sent as an e-mail with the ERS invoice attached in read-only form
Later supplier creates customer invoice in external system. The supplier receives the supplier invoice created by ERS and creates a customer invoice based on the received data.
The main difference here is the document type. In standard use case, the document will be Supplier Invoice and here invoice will be in the form of ERS Invoice.
Hope this explains. Please mark it as answered, if it is helpful.
Best Regards,
Arun
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