Cannot figure out where I am going wrong. New to accounting.

Journal Entries for Merchandise Transactions on Seller's and Buyer's Books- Perpetual System The following transactions occurred between the Decker Company and Mann Stores, Inc., during March: Mar. 8 Decker sold $13,200 worth of merchandise ($8,800 cost) to Mann Stores with terms of 2/10, n/30. 10 Mann Stores paid freight charges on the shipment from Decker Company, $200. 12 Mann Stores returned $1,200 of the merchandise ($800 cost) shipped on March 8. 17 Decker received full payment for the net amount due from the March 8 sale. 20 Mann Stores returned goods that had been billed originally at $600 ($400 cost). Decker issued a check for $588. Required Prepare the necessary journal entries for (a) the books of Decker Company and (b) the books of Mann Stores, Inc. Assume that both companies use the perpetual inventory system. Debit 13,200 $ Credit 0 13,200 O 0 8,800 0 8,800 DECKER COMPANY GENERAL JOURNAL Date Description Mar. 8 Accounts Receivable $ Sales Revenue Sold goods to Mann Stores terms 2/10, n/30. 8 Cost of Goods Sold Inventory Cost of goods sold to Mann Stores. 12 Sales Returns and Allowances Accounts Receivable Issued credit memo to Mann Stores for returned goods. 12 Inventory Cost of Goods Sold Cost of goods returned by Mann Stores. 17 Cash 1,200 0 0 1,200 800 ov 0 800 ov 5,600 x OX 0 v O Sales Discounts Accounts Receivable Received payment in full from Mann Stores. 20 Sales Returns and Allowances Sales Discounts 600 O 0 12 588 0 Cash Paid Mann Stores for returned goods. Inventory Cost of Goods Sold Cost of goods returned by Mann Stores. 400 0 0 400 Sellers journal entries Buyer's journal entries Credit Debit 13,200 $ O ~ 13,200 200 o v 0 200 ~ MANN STORES GENERAL JOURNAL Date Description Mar. 8 Inventory ~ $ Accounts Payable Purchase goods from Decker Company terms 2/10, n/30. 10 Inventory Cash Paid freight charges on Decker shipment. 12 Accounts Payable Inventory Received credit memo for goods returned to Decker Company. 17 Accounts Payable Inventory Cash Paid Decker Company in full. 20 Cash Inventory Received check for goods returned to Decker Company. 1,200 0 0 1,200 1,200 x ov 800 x O O 400 x 588 0 588