Context diagram

Flower purchasing system:

Receive purchase order information from purchasing clerks and then sends this purchase order to CEO for approval

Receive approved purchase order form from CEO

The system processes these data and

Send approved purchase orders to vendors

warehouse clerks receive purchased goods and send receiving reports to the flower purchasing system

Receive an invoice from vendors

The system processes these data and

Send purchase order payment form to CEO and then receive approved purchase order payment form from CEO

Send check to vendors

Send monthly summary report to CEO

Level 0 diagram

Activities	Data Inputs	Data Outputs
Receive Purchase Order	Purchase Order(from Purchasingclerk) Approved Purchase Order Form(from CEO)	PurchaseOrder Form (to CEO) Approved Purchase Order (to vendors) Purchase orders data (to purchase orders database)
Receive Order	Purchase order details (from purchase orders database) Receiving report (from warehouse clerk)	Purchase Order Form (to warehouse clerk) Inventory data (to flower inventory database) Receiving report details (to make the payment process)
Make Payment	Receiving report details (from receive order process) Purchase order data (from purchase order database) Vendor information (from vendor database) Invoices(from vendors) Purchase order payment form (to CEO)	Approved purchase order payment form (from CEO) Check (to vendors) Account payable details (to cash account) Payment data (to cash account)
Generate Report	Purchase order details (from Purchase order database) Payment details(from Cash account)	Monthly summary report (to CEO)

Please help me prepare context diagram and level 0 diagram with these requirements