Each commodity has a default base currency. This is derived from the default in which this commodity is traded on the exchange. The base currency is used to price the instrument and to display the results (both the Greeks and the different values).
You can change the base currency if required. For example, if you are a UK-based company and you are pricing an option which by default is priced in USD you may prefer to see the results in GBP.
To change an instrument’s base currency:
In the pricing page select the relevant currency from the Base Currency dropdown list.