In General Ledger PeopleBook says that "You can use a ChartField to designate different currency cod

In General Ledger PeopleBook says that "You can use a ChartField to designate different currency codes within a ledger", so which chartfield do you recommend for using with currency codes?

We have only one Commitment Control ledger defined as well one ledger group defined, but we need to perform budget checking process including the currency code,so we decided to add a chartfield in Commitment Control - Define Control Budgets - Budget Definitions - Keys and Translations page, but we are not sure about what chartfield should we use?

We are using General Ledger v9.2, Peopletools 8.57