Processing Payables invoices for vendor sales Sign in as Application Administrator and select Supply Management > Purchasing Processing > Manage Purchase Orders. Create and release a purchase order with lines. Create and release a receipt for the purchase order. When the FSM_ION_LoadSupplierInvoice_Inbound is received for the purchase order that you created, the Payables invoice is processed. Sign in as Process Server Administrator and select Administration > Work Units > Work Units. Verify that the FSM_ION_LoadSupplierInvoice_Inbound work unit is generated. Verify that the Payables invoice is created and release the invoice.