I thr the nafka Mina of the labeling is hoe the sale is recorded for other accounting purposes. If b and h originally carried inventory at 800 intending to sell it for 1000, and the the manufacturer has a rebate so now the sale is 800 to the customer, b and h still recognizes the 200 profit off the 800 carrying value.
A discount would be b and h buys the ite for 700 to sell at 800 and recognizes only 100 in profit. Or b and h decides to sell it at breakeven and kick in the entirety of the discount.