For example, I place an order for you to make a chair for me. You go and buy material (purchase committment) and also estimate this will give you $50 income for Q1 (unsellable inventory).
All of these (purchase committment + unsellable inventory) is now a charge on your Q1 book, because I am not going to able to buy that chair now -- another person (Trump) says you have to get persmission (license) first.