Merge pull request #8 from BrunoScorzafave/issue-4018

#4018 Removed discount duplicate and added negative attribute to the discount value

Model/Resolver/Invoice/InvoiceItems.php

@@ -160,7 +160,7 @@ protected function formatDiscountDetails(OrderInterface $associatedOrder, Invoic
             $discounts = [];
         } else {
             $discounts[] = [
-                'label' => $associatedOrder->getDiscountDescription() ?? __('Discount'),
+                'label' => $associatedOrder->getDiscountDescription(),
                 'amount' => [
                     'value' => abs($invoiceItem->getDiscountAmount()) ?? 0,
                     'currency' => $associatedOrder->getOrderCurrencyCode()