The accounts payable (A/P) department receives invoices from vendors. Each invoice includes the Purchase Order (PO) number. An A/P clerk enters PO number from the invoice into the computer, and the computer displays the PO. The clerk compares the information on PO shown on the screen and the invoice, and, assuming they match, keys in the invoice data. The computer creates a new record for the invoice (in the invoices data source) and updates the status of PO to invoice received. The general ledger master data (Accounts Payable) are also updated.

Once a month, the A/P department requests a list of open invoices. The computer system retrieves the invoices and shows on the screen. An A/P clerk selects invoices to be paid. The computer system updates the accounts payable, and marks the PO and the invoice as paid. The computer then prints a check in the accounts payable department. Accounts payable mails the check to the vendor.

Required:

Prepare a context data flow diagram

Prepare a document flowchart

Prepare a business process diagram