7.16 Supremo Ltd is a major manufacturer of industrial machinery. When the stores department requires items to be purchased, they issue a three-part pre-numbered purchase requisition that needs to be approved by the store manager. Copy 1 is sent to the purchasing department, copy 2 is sent to the accounts payable department and copy 3 is les in the stores department. On receipt of an approved purchase requisition, the purchasing department issues a ve-part pre-numbered purchase order. Copy 1 is sent to the supplier, copies 2 and 3 are forwarded to the receiving department, copy 4 is forwarded to the accounts payable department and copy 5 is files in the purchasing department. When goods are received, the receiving department just stamps 'order received' on its two copies of the purchase order, which then forms its receiving record. One copy of the receiving record is led in the receiving department and the other is fonvarded to the accounts payable department. The accounts payable department checks that there is a purchase requisition, purchase order and receiving record for each supplier invoice and then approves it for payment. The accounts payable department prepares a prenumbered payment voucher and forwards it along with the supplier's invoice, purchase requisition, purchase order and receiving report, to the financial accountant, who signs the payment voucher, completes the payment by bank transfer to the supplier and returns the supporting documents to the accounts payable department. At the end of the month the assistant accountant undertakes a sequence check of all prenumbered documents. The nancial accountant receives the monthly bank statement, prepares a bank reconciliation and investigates any reconciling items Required: a] Identify the weaknesses in Supremo's internal control concerning the purchases and payment functions b) Explain why each is a weakness and provide a recommendation as to how to overcome the weakness