ACP2E-92: Credit memo with decimal qty could be created via API even in case decimal qty disabled

Author: glo23503

app/code/Magento/Sales/Model/Order/Creditmemo/Validation/QuantityValidator.php

@@ -83,6 +83,14 @@ public function validate($entity)
             }
             $orderItem = $orderItemsById[$item->getOrderItemId()];
 
+            if (!$orderItem->getIsQtyDecimal() && (floor($item->getQty()) !== $item->getQty())) {
+                $messages[] =__(
+                    'You cannot use decimal quantity to refund item "%1".',
+                    $item->getSku()
+                );
+                continue;
+            }
+
             if (!$this->canRefundItem($orderItem, $item->getQty(), $invoiceQtysRefundLimits) ||
                 !$this->isQtyAvailable($orderItem, $item->getQty())
             ) {

app/code/Magento/Sales/i18n/en_US.csv

@@ -806,3 +806,4 @@ If set YES Email field will be required during Admin order creation for new Cust
 "The coupon code has been removed.","The coupon code has been removed."
 "This creditmemo no longer exists.","This creditmemo no longer exists."
 "Add to address book","Add to address book"
+"You cannot use decimal quantity to refund item","You cannot use decimal quantity to refund item"