ENGCOM-3982: [Backport] fixed Negative order amount in dashboard #20647

 - Merge Pull Request #20647 from amol2jcommerce/magento2:2.2-develop-PR-port-19372
 - Merged commits:
   1. a8c0b35
   2. 5eba9a4

Author: magento-engcom-team

app/code/Magento/Reports/Model/ResourceModel/Order/Collection.php

@@ -3,7 +3,6 @@
  * Copyright © Magento, Inc. All rights reserved.
  * See COPYING.txt for license details.
  */
-
 namespace Magento\Reports\Model\ResourceModel\Order;
 
 use Magento\Framework\DB\Select;
@@ -81,7 +80,7 @@ class Collection extends \Magento\Sales\Model\ResourceModel\Order\Collection
      * @param \Magento\Framework\Stdlib\DateTime\TimezoneInterface $localeDate
      * @param \Magento\Sales\Model\Order\Config $orderConfig
      * @param \Magento\Sales\Model\ResourceModel\Report\OrderFactory $reportOrderFactory
-     * @param null $connection
+     * @param \Magento\Framework\DB\Adapter\AdapterInterface $connection
      * @param \Magento\Framework\Model\ResourceModel\Db\AbstractDb $resource
      *
      * @SuppressWarnings(PHPMD.ExcessiveParameterList)
@@ -825,7 +824,7 @@ protected function getTotalsExpression(
     ) {
         $template = ($storeId != 0)
             ? '(main_table.base_subtotal - %2$s - %1$s - ABS(main_table.base_discount_amount) - %3$s)'
-            : '((main_table.base_subtotal - %1$s - %2$s - ABS(main_table.base_discount_amount) - %3$s) '
+            : '((main_table.base_subtotal - %1$s - %2$s - ABS(main_table.base_discount_amount) + %3$s) '
                 . ' * main_table.base_to_global_rate)';
         return sprintf($template, $baseSubtotalRefunded, $baseSubtotalCanceled, $baseDiscountCanceled);
     }