Hello @jinjin ,
This number has to do with your inventory valuation. It looks like you are not purchasing directly into your cost of sales (Purchases) account; when you purchase an item, it goes into inventory and the JE looks like this:
DR Inventory (Balance Sheet)
CR Accounts Payable (Balance Sheet)
This entry does not affect your P & L; only the balance sheet. Your P & L is affected only when you sell that item. See below.
CR Inventory (Balance Sheet)
DR Purchases (P & L)
QB uses an average price valuation for that item, based on the history of each time you purchased it.
For whatever reason, when you sold the item you had previously purchased, it only had an inventory value of $.23 on the books, thus the entry you see and the cost you see on the P & L. You will have to look at how you are handling your inventory, find the item that was purchased and sold and look at the history. Check to see that you have your inventory items and accounts set up properly. Here is a good resource to explain how the inventory in QB works.
http://www.numbercruncher.com/WebHelp/AO4/How_does_QuickBooks_handle_Inventory.htm
Good luck.
