MC-31594: Duplicate SKU in the backend while importing products via CSV

Author: yelahin-serhiy

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

@@ -307,7 +307,6 @@ class Product extends \Magento\ImportExport\Model\Import\Entity\AbstractEntity
         // Can't add new translated strings in patch release
         'invalidLayoutUpdate' => 'Invalid format.',
         'insufficientPermissions' => 'Invalid format.',
-        ValidatorInterface::ERROR_SKU_MARGINAL_WHITESPACES => 'SKU contains marginal whitespaces'
     ];
     //@codingStandardsIgnoreEnd
 

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

@@ -87,8 +87,6 @@ interface RowValidatorInterface extends \Magento\Framework\Validator\ValidatorIn
 
     const ERROR_DUPLICATE_MULTISELECT_VALUES = 'duplicatedMultiselectValues';
 
-    const ERROR_SKU_MARGINAL_WHITESPACES = 'skuMarginalWhitespaces';
-
     /**
      * Value that means all entities (e.g. websites, groups etc.)
      */

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

@@ -17,6 +17,8 @@
  */
 class Validator extends AbstractValidator implements RowValidatorInterface
 {
+    private const ERROR_SKU_MARGINAL_WHITESPACES = "Sku contains marginal whitespaces";
+
     /**
      * @var RowValidatorInterface[]|AbstractValidator[]
      */
@@ -75,7 +77,7 @@ protected function textValidation($attrCode, $type)
         } elseif ($attrCode == Product::COL_SKU) {
             $valid = $this->string->strlen($val) <= SKU::SKU_MAX_LENGTH;
             if ($this->string->strlen($val) !== $this->string->strlen(trim($val))) {
-                $this->_addMessages([RowValidatorInterface::ERROR_SKU_MARGINAL_WHITESPACES]);
+                $this->_addMessages([self::ERROR_SKU_MARGINAL_WHITESPACES]);
                 return false;
             }
         } else {