Hi, I have a similar concern. just like what she said above, the cost of the inventory might change from time to time. for example, on Jan 1. cost of the item is 100. on Jan 5, I sold the item. so I need to restock, I purchased the item but with a cost now 150. and I sold that items. 

question. will me recording the new cost of the item affect the cost of sales on the sale transaction I did on Jan 5?