DELIMITER $$
CREATE OR REPLACE DEFINER=`vn`@`localhost` TRIGGER `vn`.`invoiceIn_afterUpdate`
	AFTER UPDATE ON `invoiceIn`
	FOR EACH ROW
BEGIN
	DECLARE vIsEuro BOOL;
	
	SELECT `code` = 'EUR' INTO vIsEuro 
		FROM currency 
		WHERE id = NEW.currencyFk;

	IF (NOT NEW.issued <=> OLD.issued    
		OR NEW.currencyFk <> OLD.currencyFk) THEN

		UPDATE invoiceInTax iit
				JOIN invoiceIn ii ON ii.id = iit.invoiceInFk
				LEFT JOIN referenceRate rr ON rr.dated = ii.issued
					AND rr.currencyFk = ii.currencyFk 
			SET iit.taxableBase = IF(vIsEuro, iit.taxableBase, iit.foreignValue / rr.value),
				iit.foreignValue = IF(vIsEuro, NULL, iit.foreignValue)
			WHERE ii.id = NEW.id;
		
		UPDATE invoiceInDueDay iidd
				JOIN invoiceIn ii ON ii.id = iidd.invoiceInFk
				LEFT JOIN referenceRate rr ON rr.dated = ii.issued
					AND rr.currencyFk = ii.currencyFk 
			SET iidd.amount = IF(vIsEuro, iidd.amount, iidd.foreignValue / rr.value),
				iidd.foreignValue = IF(vIsEuro, NULL, iidd.foreignValue)
			WHERE ii.id = NEW.id;    
    END IF;
END$$
DELIMITER ;