Accounts keep their native currency. BI and statements use base-currency measures; the GL base amount is maintained for every entry.
- Open Tools → FX Revaluation (/tools/fx-reval).
- Preview the accounts to revalue and the rate for the period (GET /v1/ledger/fx-revaluation/preview).
- Post the revaluation. The gain or loss lands on the configured account; the run is audited.