please create DFD level 0 and DFD level 1

Gresko Toys is very involved in purchasing the parts used in the production of toys. The company uses a periodic inventory system. When sales orders are received, Bob Gresko sends a copy to the production floor. This copy is used to trigger production as well as to indicate the potential need of parts not available in inventory. The inventory clerks search for parts, when parts are out of stock, the inventory clerks issue two copies of a purchase requisition. Mr. Gresko approves this requisition before a purchase order is issued. One copy is sent to the purchasing manager and the other to the accounting department. The buyer checks the suppliers' prices for the needed parts. Based on cost as well as past experience with a particular supplier, two suppliers are recommended. The purchasing manager subsequently decides on the supplier, and four copies of a purchase order are issued. The first copy is sent to the supplier, the purchasing manager files the second copy, the third is sent to the warehouse, and the fourth is sent to the accounting department. All purchase order copies are filed by supplier number Approximately a week after the initiation of the purchase, the parts are received. The warehouse manager, along with the inventory clerks, inspects and counts the received parts. The purchase order copy that the purchasing manager previously received is used as the basis of comparison A receiving report in three parts is prepared. If prices and quantities received agree with those ordered and with the information on the packing slip the carrier receives, the parts are accepted If any differences exist, Mr. Gresko is called in to decide whether to accept or reject the parts, On many occasions, acceptance of parts will be delayed for days until the suppliers are informed and an agreement is reached One copy of the receiving report is sent to the purchasing manager and another to the accounting department. The original copy is kept at the warehouse. The accounting clerk files the receiving report along with the purchase requisition and the purchase order by supplier number. The clerk also prepares the necessary journal entry and credits the related supplier in the subsidiary ledger When the supplier sends the invoice, the accounting clerk matches the information to the purchase requisition, purchase order and receiving report and prepares a disbursement voucher. This voucher is used for two purposes. It initiates the journal entry for the disbursement of cash, and the cashier uses it to issue a check. Randi Gresko, as well as Mrs. Gresko, must sign the checks before they are sent to the suppliers. Gresko Toys is very involved in purchasing the parts used in the production of toys. The company uses a periodic inventory system. When sales orders are received, Bob Gresko sends a copy to the production floor. This copy is used to trigger production as well as to indicate the potential need of parts not available in inventory. The inventory clerks search for parts, when parts are out of stock, the inventory clerks issue two copies of a purchase requisition. Mr. Gresko approves this requisition before a purchase order is issued. One copy is sent to the purchasing manager and the other to the accounting department. The buyer checks the suppliers' prices for the needed parts. Based on cost as well as past experience with a particular supplier, two suppliers are recommended. The purchasing manager subsequently decides on the supplier, and four copies of a purchase order are issued. The first copy is sent to the supplier, the purchasing manager files the second copy, the third is sent to the warehouse, and the fourth is sent to the accounting department. All purchase order copies are filed by supplier number Approximately a week after the initiation of the purchase, the parts are received. The warehouse manager, along with the inventory clerks, inspects and counts the received parts. The purchase order copy that the purchasing manager previously received is used as the basis of comparison A receiving report in three parts is prepared. If prices and quantities received agree with those ordered and with the information on the packing slip the carrier receives, the parts are accepted If any differences exist, Mr. Gresko is called in to decide whether to accept or reject the parts, On many occasions, acceptance of parts will be delayed for days until the suppliers are informed and an agreement is reached One copy of the receiving report is sent to the purchasing manager and another to the accounting department. The original copy is kept at the warehouse. The accounting clerk files the receiving report along with the purchase requisition and the purchase order by supplier number. The clerk also prepares the necessary journal entry and credits the related supplier in the subsidiary ledger When the supplier sends the invoice, the accounting clerk matches the information to the purchase requisition, purchase order and receiving report and prepares a disbursement voucher. This voucher is used for two purposes. It initiates the journal entry for the disbursement of cash, and the cashier uses it to issue a check. Randi Gresko, as well as Mrs. Gresko, must sign the checks before they are sent to the suppliers