The "Price unit" on the trade agreements is not copied to order lines; it converts the entered price into the item's unit.
You can read more about trade agreements here: https://download.microsoft.com/download/0/2/9/02972c8b-0159-4936-a3ef-1e64252b2d2f/TradeAgreementsInAX.pdf
Many of the principles carry over to D365 F&O.
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