MAGETWO-83820: [2.3.x] SKU parameter in capital letters on CSV ignored by database in Import but OK'd by validator

Author: svitja

app/code/Magento/ConfigurableImportExport/Model/Import/Product/Type/Configurable.php

@@ -41,16 +41,11 @@ class Configurable extends \Magento\CatalogImportExport\Model\Import\Product\Typ
      * @var array
      */
     protected $_messageTemplates = [
-        self::ERROR_ATTRIBUTE_CODE_IS_NOT_SUPER =>
-            'Attribute with code "%s" is not super',
-        self::ERROR_INVALID_OPTION_VALUE =>
-            'Invalid option value for attribute "%s"',
-        self::ERROR_INVALID_WEBSITE =>
-            'Invalid website code for super attribute',
-        self::ERROR_DUPLICATED_VARIATIONS =>
-            'SKU %s contains duplicated variations',
-        self::ERROR_UNIDENTIFIABLE_VARIATION =>
-            'Configurable variation "%s" is unidentifiable',
+        self::ERROR_ATTRIBUTE_CODE_IS_NOT_SUPER => 'Attribute with code "%s" is not super',
+        self::ERROR_INVALID_OPTION_VALUE => 'Invalid option value for attribute "%s"',
+        self::ERROR_INVALID_WEBSITE => 'Invalid website code for super attribute',
+        self::ERROR_DUPLICATED_VARIATIONS => 'SKU %s contains duplicated variations',
+        self::ERROR_UNIDENTIFIABLE_VARIATION => 'Configurable variation "%s" is unidentifiable',
     ];
 
     /**
@@ -521,11 +516,10 @@ protected function _parseVariations($rowData)
                     $position += 1;
                 }
             } else {
-                $errorCode = self::ERROR_UNIDENTIFIABLE_VARIATION;
                 throw new LocalizedException(
                     __(
                         sprintf(
-                            $this->_messageTemplates[$errorCode],
+                            $this->_messageTemplates[self::ERROR_UNIDENTIFIABLE_VARIATION],
                             $variation
                         )
                     )