This would save clicking in to the profit analysis tab on the top each time you want to know how 1, the cost 2, how much profit your selling it for. also it would stop selling below cost in the event of an error in the pricing of the product. You can simply decide to made 20% profit (as an example) on that product, without needing to know the cost. All it needs is an additional box at the end of the product row that will calculate the selling price based on the percentage you pout in that box. if there are set prices set up it would reflect that profit made based on the set price. its an easy way to check things are correct aswell as if the cost and or selling price were wrong the profit % would be either negative or very high.
i have used other systems that had this and it saved a lot of time and made checking very quick. also in the event of having to change the price manually its a lot easier to alter that % box by a few percent to lower the price rather than going into the profit tab and trying to remember or write it down before closing that and going back the the invoice again. if you had to do this on multiple products it time consuming and annoying to be honest.
We have similar issues with this, if my purchasing person adds in new buying price and its higher, they might miss changing the selling price, also every product could have different margin, there is no way of knowing what exactly the margin you want in this product. a box with requested margin here would be so handy. It would save so much time and save us on lost margin due to small changes in buying prices.