@IsabelleR Customer Order and Customer Invoice will always use the same currency rate type. When Customer Invoice is created it’s fetching all the amounts / rates / tax codes from the CO Line.

As far as I know you can specify different currency rate types for your Customer Orders compared to the Purchase Orders by setting up the Default Buy Currency Rate Type and Default Sell Currency Rate Type.

If your customer’s subsidiaries are also in IFS, and you’re using inter-co flows, I guess this would work if the subsidiary is using a different currency rate for Buy compared to the headquarter’s currency rate for Sell. This way the subsidiary PO will be using a different currency rate type then the headquarters Customer Order. But within the same company, to have different currency rate types for CO vs Invoice it’s not possible without a BIG modification .