format -> to formatCurrency

locale.xml

@@ -32,7 +32,7 @@
             <de><![CDATA[Währungen automatisch von der ECP importieren]]></de>
             <en><![CDATA[Import currencies automatic from the ECP]]></en>
         </locale>
-        
+
         <!-- currencies -->
         <locale name="currency.EUR.text">
             <de><![CDATA[Euro]]></de>

src/QUI/ERP/Currency/Currency.php

@@ -120,7 +120,7 @@ public function format($amount)
             \NumberFormatter::CURRENCY
         );
 
-        return $Formatter->format($amount);
+        return $Formatter->formatCurrency($amount, $this->getCode());
     }
 
     /**