Model the following business process. Use pools$/$lanes where needed.

An invoice from a vendor arrives via email with a PDF attachment. The email inbox in checked every hour by an Accounts Payable clerk. When there is a new email, the PDF attachment is downloaded and sent to an OCR $($optical character recognition$)$ application. The clerk then loads the PDF into SAP and links the OCR result to the invoice now logged in SAP.

A second clerk reviews the invoice details, matching the invoice to receipts at the loading dock in SAP $($shipping clerk registers each arrival of goods in SAP$).$ The clerk also checks if the invoice matches a Purchase Order $($PO$)$ in SAP. If the invoice, the receipt, and the PO all have matching data, the clerk authorizes the vendor to be paid.

A Treasury clerk reviews all the payments approved and checks that there is sufficient cash in the bank account used to pay vendors. If there is enough cash, the clerk authorizes SAP to contact the bank and pay the vendors electronically.