****** Design ****** The *Currency RS Module* extends some existing concepts. .. _model-currency.cron: Scheduled Rate Updates ====================== When the *Currency RS Module* is activated, the `Serbian National Bank <https://nbs.rs/en/indeks/>`_ is added as a source. If it is selected then only the Serbian Dinar can be used as a base currency. .. seealso:: The `Scheduled Rate Updates <currency:model-currency.cron>` concept is introduced by the :doc:`Currency Module <currency:index>`.