refactor: use erp classes -> no invoice dependencies

src/QUI/ERP/Coupons/CouponCode.php

@@ -661,7 +661,7 @@ public function addToOrder(QUI\ERP\Order\OrderInProcess $Order)
 
                 // @todo wenn fest preis (zb 10$), dann eigener produkt typ hinzufügen
 
-                $articles[] = new QUI\ERP\Accounting\Invoice\Articles\Text([
+                $articles[] = new QUI\ERP\Accounting\Articles\Text([
                     'id'          => '-',
                     'articleNo'   => $Coupon->getCode(),
                     'title'       => $PriceFactor->getTitle(),
@@ -682,7 +682,7 @@ public function addToOrder(QUI\ERP\Order\OrderInProcess $Order)
         }
 
         /**
-         * @param QUI\ERP\Accounting\Invoice\Articles\Text $Article
+         * @param QUI\ERP\Accounting\Articles\Text $Article
          * @return boolean
          */
         $isInArticles = function ($Article) use ($Order) {