ENGCOM-1514: Issue 14351: Product import doesn't change \`Enable Qty …

…Increments\` field #14352

 - Merge Pull Request #14352 from simpleadm/magento2:fix-product-import-enable-qty-inc
 - Merged commits:
   1. 1268692
   2. 16b8b2c
   3. cb83575

app/code/Magento/CatalogImportExport/Model/Import/Product.php

@@ -10,6 +10,7 @@
 use Magento\CatalogImportExport\Model\Import\Product\MediaGalleryProcessor;
 use Magento\CatalogImportExport\Model\Import\Product\ImageTypeProcessor;
 use Magento\CatalogImportExport\Model\Import\Product\RowValidatorInterface as ValidatorInterface;
+use Magento\CatalogInventory\Api\Data\StockItemInterface;
 use Magento\CatalogImportExport\Model\StockItemImporterInterface;
 use Magento\Framework\App\Filesystem\DirectoryList;
 use Magento\Framework\App\ObjectManager;
@@ -2618,7 +2619,10 @@ private function _setStockUseConfigFieldsValues($rowData)
     {
         $useConfigFields = [];
         foreach ($rowData as $key => $value) {
-            $useConfigName = self::INVENTORY_USE_CONFIG_PREFIX . $key;
+            $useConfigName = $key === StockItemInterface::ENABLE_QTY_INCREMENTS
+                ? StockItemInterface::USE_CONFIG_ENABLE_QTY_INC
+                : self::INVENTORY_USE_CONFIG_PREFIX . $key;
+
             if (isset($this->defaultStockData[$key])
                 && isset($this->defaultStockData[$useConfigName])
                 && !empty($value)