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It would be great to have a fifo system for selling products. So when we buy qty 20 at €1 the starting cost price to add margin to will be €1 and then if we buy qty 50 at €2 the starting cost price to add margin to wont change to €2 until all the first 20 items are sold first, so then it will change the starting cost price to be €2 when only 50 items left and so on..