Merge commit 'refs/pull/2753/head' of github.com:magento/magento2 into FearlessKiwis-MAGETWO-48452-GITHUB-2451-base_tax_amount-is-inaccurate-for-Credit-Memo-items_NEW

Author: Partica, Cristian

app/code/Magento/Sales/Model/Order/Creditmemo/Total/Tax.php

@@ -42,7 +42,7 @@ public function collect(\Magento\Sales\Model\Order\Creditmemo $creditmemo)
                  */
 
                 $tax = $orderItemTax - $orderItem->getTaxRefunded();
-                $baseTax = $baseOrderItemTax - $orderItem->getTaxRefunded();
+                $baseTax = $baseOrderItemTax - $orderItem->getBaseTaxRefunded();
                 $discountTaxCompensation = $orderItem->getDiscountTaxCompensationInvoiced() -
                     $orderItem->getDiscountTaxCompensationRefunded();
                 $baseDiscountTaxCompensation = $orderItem->getBaseDiscountTaxCompensationInvoiced() -