The payments department at Slick Sales has issued a cheque for an invoice it has received from Office Supplies Ltd. The payables clerk has three documents, (1) a receipted purchase order, (2) a receiving report, and (3) an invoice. The clerk has prepared the accompanying cheque and its signed, ready for sending. b) Explain how the purchase order, receiving report and invoice play an important role in the authorisation of payments to accounts payable. (5 marks) __________________________________________________________________