Structuring Currency column in fact table

Hi,

We have a sales fact table containing several profit  amount columns for profit amount in sale currency, profit amount in purchase currency etc these are FACTS. Next to them we also have the sale currency name (ex: USD/ EUR) ,  purchase currency name etc. themselves.

Should the currency name columns be set as FACT columns?

I'm trying to figure out how this should be best structured (no current need for currency conversions).

Thanks

Namnami