Currently, the currency on the line items is limited to match the deal. Calculations on the line item level will allow line items to have different currencies while still aggregating accurately.
An example use case is when we have suppliers sending over invoices in different currencies to what we are invoicing. These external invoices are added to the deal as it is a passed on cost but currently we have to convert these values ourselves instead of using the saved conversion rates.
I see this working similar to the product library where there is a cost for price for each currency, we just need a total for each currency so we can decide how the values roll up.
