In SAP Fieldglass, SOW Invoices can be created manually: either the Buyer determines the invoice billing schedule (by currency), or the Supplier is responsible for creating invoices by running an invoice file each time.
However, the recommended practice is to configure auto-invoicing instead.
When auto-invoice is enabled, the system will generate an invoice automatically from a completed SOW Characteristic or submitted Time Sheet or Expense Sheet, once it has been fully approved. Auto Invoice essentially means there is no manual intervention needed from the Supplier again.
Once the work items are in approved status, the application creates an invoice line item for each individual Time Sheet, Expense Sheet, or SOW Characteristic that was approved. Based on the invoicing schedule determined by the buyer, all new work items are pulled into one invoice file.