Currently, purchase currency on a product item just gets set to home currency during the product import. However, you could have suppliers who quote and list the product in their home currency. The currency of the supplier should be updated here instead. This would make managing products and the purchase information easier from within the CRM.
As we deal in multiple currencies with suppliers it would be important that we are able to show the currency that relates to each product. This will help our sales team to negotiate deals more accurately.