The assignment involves processing customer orders and managing invoices. When a customer places an order, credit checks are performed to ensure the order is accepted. If accepted, the order is added to a list accessible by Invoicing and Stock Control. The system then generates an invoice for the order, which includes details such as product codes, quantities, unit costs, and total amounts due. Any discrepancies in payment slips returned by customers will result in the payment being sent back for correction. Overdue invoices are also managed through a reminder letter generation process. Finally, sales management can initiate reports on overall sales performance and aged debt analysis to monitor customer debts.