OnBeforeCurrencyUpdate

bool event_handler(
   string currency,
   array arFields
);

OnBeforeCurrencyUpdate event is called prior to updating an existing currency. Allows to modify existing data.

Parameter	Description
currency	Currency ID.
arFields	Associative array of currency parameters. List of available array keys can be found in CCurrency::Update.

Can return false, if an update must be prevented. Otherwise, true value must be returned.