diff --git a/app/code/Magento/Catalog/Model/Product/Attribute/Backend/Sku.php b/app/code/Magento/Catalog/Model/Product/Attribute/Backend/Sku.php
old mode 100644
new mode 100755
index 98738e055ca8f..44404710eb2ae
--- a/app/code/Magento/Catalog/Model/Product/Attribute/Backend/Sku.php
+++ b/app/code/Magento/Catalog/Model/Product/Attribute/Backend/Sku.php
@@ -3,13 +3,14 @@
  * Copyright © Magento, Inc. All rights reserved.
  * See COPYING.txt for license details.
  */
-
 namespace Magento\Catalog\Model\Product\Attribute\Backend;
 
 use Magento\Catalog\Model\Product;
 
 /**
- * Catalog product SKU backend attribute model.
+ * Catalog product SKU backend attribute model
+ *
+ * @author     Magento Core Team <core@magentocommerce.com>
  */
 class Sku extends \Magento\Eav\Model\Entity\Attribute\Backend\AbstractBackend
 {
@@ -58,6 +59,15 @@ public function validate($object)
                 __('SKU length should be %1 characters maximum.', self::SKU_MAX_LENGTH)
             );
         }
+
+        $attribute = $this->getAttribute();
+        $entity = $attribute->getEntity();
+        if (!$entity->checkAttributeUniqueValue($attribute, $object)) {
+            throw new \Magento\Framework\Exception\LocalizedException(
+                __('SKU is already in use.')
+            );
+        }
+
         return true;
     }
 
@@ -94,8 +104,9 @@ protected function _generateUniqueSku($object)
      */
     public function beforeSave($object)
     {
-        $this->_generateUniqueSku($object);
-        $this->trimValue($object);
+        if ($object->getIsDuplicate()) {
+            $this->_generateUniqueSku($object);
+        }
         return parent::beforeSave($object);
     }
 
@@ -126,19 +137,4 @@ protected function _getLastSimilarAttributeValueIncrement($attribute, $object)
         $data = $connection->fetchOne($select, $bind);
         return abs((int)str_replace($value, '', $data));
     }
-
-    /**
-     * Remove extra spaces from attribute value before save.
-     *
-     * @param Product $object
-     * @return void
-     */
-    private function trimValue($object)
-    {
-        $attrCode = $this->getAttribute()->getAttributeCode();
-        $value = $object->getData($attrCode);
-        if ($value) {
-            $object->setData($attrCode, trim($value));
-        }
-    }
 }
diff --git a/dev/tests/functional/tests/app/Magento/CatalogUrlRewrite/Test/TestCase/CreateDuplicateUrlProductEntity.php b/dev/tests/functional/tests/app/Magento/CatalogUrlRewrite/Test/TestCase/CreateDuplicateUrlProductEntity.php
index 2cfaecd8efe5d..591a0d8eded23 100644
--- a/dev/tests/functional/tests/app/Magento/CatalogUrlRewrite/Test/TestCase/CreateDuplicateUrlProductEntity.php
+++ b/dev/tests/functional/tests/app/Magento/CatalogUrlRewrite/Test/TestCase/CreateDuplicateUrlProductEntity.php
@@ -68,6 +68,7 @@ public function __prepare(Category $category)
      * Run create product simple entity test.
      *
      * @param CatalogProductSimple $product
+     * @param CatalogProductSimple $product2
      * @param Category $category
      * @param CatalogProductIndex $productGrid
      * @param CatalogProductNew $newProductPage
@@ -77,6 +78,7 @@ public function __prepare(Category $category)
      */
     public function testCreate(
         CatalogProductSimple $product,
+        CatalogProductSimple $product2,
         Category $category,
         CatalogProductIndex $productGrid,
         CatalogProductNew $newProductPage,
@@ -92,13 +94,15 @@ public function testCreate(
             ['configData' => $this->configData, 'flushCache' => $this->flushCache]
         )->run();
 
-        for ($index = 0; $index < 2; $index++) {
-            // Duplicate product
-            $productGrid->open();
-            $productGrid->getGridPageActionBlock()->addProduct('simple');
-            $newProductPage->getProductForm()->fill($product, null, $category);
-            $newProductPage->getFormPageActions()->save();
-        }
+        $productGrid->open();
+        $productGrid->getGridPageActionBlock()->addProduct('simple');
+        $newProductPage->getProductForm()->fill($product, null, $category);
+        $newProductPage->getFormPageActions()->save();
+
+        $productGrid->open();
+        $productGrid->getGridPageActionBlock()->addProduct('simple');
+        $newProductPage->getProductForm()->fill($product2, null, $category);
+        $newProductPage->getFormPageActions()->save();
 
         return ['product' => $product];
     }
diff --git a/dev/tests/functional/tests/app/Magento/CatalogUrlRewrite/Test/TestCase/CreateDuplicateUrlProductEntity.xml b/dev/tests/functional/tests/app/Magento/CatalogUrlRewrite/Test/TestCase/CreateDuplicateUrlProductEntity.xml
old mode 100644
new mode 100755
index 8110ed1ed00b1..17f3b75e70a70
--- a/dev/tests/functional/tests/app/Magento/CatalogUrlRewrite/Test/TestCase/CreateDuplicateUrlProductEntity.xml
+++ b/dev/tests/functional/tests/app/Magento/CatalogUrlRewrite/Test/TestCase/CreateDuplicateUrlProductEntity.xml
@@ -8,13 +8,19 @@
 <config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="../../../../../../../vendor/magento/mtf/etc/variations.xsd">
     <testCase name="Magento\CatalogUrlRewrite\Test\TestCase\CreateDuplicateUrlProductEntity" summary="Create Simple Product" ticketId="MAGETWO-69427">
         <variation name="CreateDuplicateUrlProductEntityTestVariation1" summary="Create Duplicate Url Product">
-            <data name="tag" xsi:type="string">test_type:acceptance_test, test_type:extended_acceptance_test, severity:S1, mftf_migrated:yes</data>
-            <data name="product/data/url_key" xsi:type="string">simple-product-%isolation%</data>
+            <data name="tag" xsi:type="string">test_type:acceptance_test, test_type:extended_acceptance_test, severity:S1</data>
+            <data name="product/data/url_key" xsi:type="string">simple-product-samekey</data>
             <data name="product/data/name" xsi:type="string">Simple Product %isolation%</data>
             <data name="product/data/sku" xsi:type="string">simple_sku_%isolation%</data>
             <data name="product/data/price/value" xsi:type="string">10000</data>
             <data name="product/data/weight" xsi:type="string">50</data>
             <data name="product/data/quantity_and_stock_status/qty" xsi:type="string">657</data>
+            <data name="product2/data/url_key" xsi:type="string">simple-product-samekey</data>
+            <data name="product2/data/name" xsi:type="string">Simple Product %isolation%</data>
+            <data name="product2/data/sku" xsi:type="string">simple_sku_%isolation%</data>
+            <data name="product2/data/price/value" xsi:type="string">10000</data>
+            <data name="product2/data/weight" xsi:type="string">50</data>
+            <data name="product2/data/quantity_and_stock_status/qty" xsi:type="string">657</data>
             <constraint name="Magento\CatalogUrlRewrite\Test\Constraint\AssertProductUrlDuplicateErrorMessage" />
         </variation>
     </testCase>
diff --git a/dev/tests/integration/testsuite/Magento/Catalog/Model/Product/Attribute/Backend/SkuTest.php b/dev/tests/integration/testsuite/Magento/Catalog/Model/Product/Attribute/Backend/SkuTest.php
index f557919897869..63b64e102e585 100644
--- a/dev/tests/integration/testsuite/Magento/Catalog/Model/Product/Attribute/Backend/SkuTest.php
+++ b/dev/tests/integration/testsuite/Magento/Catalog/Model/Product/Attribute/Backend/SkuTest.php
@@ -14,18 +14,34 @@ class SkuTest extends \PHPUnit\Framework\TestCase
     /**
      * @magentoDataFixture Magento/Catalog/_files/product_simple.php
      */
-    public function testGenerateUniqueSkuExistingProduct()
+    public function testGenerateUniqueSkuExistingProductDuplication()
     {
         $repository = \Magento\TestFramework\Helper\Bootstrap::getObjectManager()->create(
             \Magento\Catalog\Model\ProductRepository::class
         );
         $product = $repository->get('simple');
         $product->setId(null);
+        $product->setIsDuplicate(true);
         $this->assertEquals('simple', $product->getSku());
         $product->getResource()->getAttribute('sku')->getBackend()->beforeSave($product);
         $this->assertEquals('simple-1', $product->getSku());
     }
 
+    /**
+     * @magentoDataFixture Magento/Catalog/_files/product_simple.php
+     */
+    public function testGenerateUniqueSkuExistingProductNoDuplication()
+    {
+        $repository = \Magento\TestFramework\Helper\Bootstrap::getObjectManager()->create(
+            \Magento\Catalog\Model\ProductRepository::class
+        );
+        $product = $repository->get('simple');
+        $product->setId(null);
+        $this->assertEquals('simple', $product->getSku());
+        $product->getResource()->getAttribute('sku')->getBackend()->beforeSave($product);
+        $this->assertEquals('simple', $product->getSku());
+    }
+
     /**
      * @param $product \Magento\Catalog\Model\Product
      * @dataProvider uniqueSkuDataProvider
@@ -48,16 +64,15 @@ public function testGenerateUniqueLongSku()
             \Magento\Catalog\Model\ProductRepository::class
         );
         $product = $repository->get('simple');
-        $product->setSku('0123456789012345678901234567890123456789012345678901234567890123');
+        $product->setSku('0123456789012345678901234567890123456789012345678901234567890123')->save();
 
         /** @var \Magento\Catalog\Model\Product\Copier $copier */
         $copier = \Magento\TestFramework\Helper\Bootstrap::getObjectManager()->get(
             \Magento\Catalog\Model\Product\Copier::class
         );
-        $copier->copy($product);
+        $copy = $copier->copy($product);
         $this->assertEquals('0123456789012345678901234567890123456789012345678901234567890123', $product->getSku());
-        $product->getResource()->getAttribute('sku')->getBackend()->beforeSave($product);
-        $this->assertEquals('01234567890123456789012345678901234567890123456789012345678901-1', $product->getSku());
+        $this->assertEquals('01234567890123456789012345678901234567890123456789012345678901-1', $copy->getSku());
     }
 
     /**
diff --git a/dev/tests/integration/testsuite/Magento/CatalogRule/Model/Indexer/IndexerBuilderTest.php b/dev/tests/integration/testsuite/Magento/CatalogRule/Model/Indexer/IndexerBuilderTest.php
index 13f6e5ae0e8ed..a1b8e1662afeb 100644
--- a/dev/tests/integration/testsuite/Magento/CatalogRule/Model/Indexer/IndexerBuilderTest.php
+++ b/dev/tests/integration/testsuite/Magento/CatalogRule/Model/Indexer/IndexerBuilderTest.php
@@ -137,10 +137,11 @@ protected function prepareProducts()
 
         $this->product->setStoreId(0)->setData('test_attribute', 'test_attribute_value')->save();
         $this->productSecond = clone $this->product;
-        $this->productSecond->setId(null)->setUrlKey('product-second')->save();
+        $this->productSecond->setId(null)->setUrlKey('product-second')->setIsDuplicate(true)->save();
         $this->productThird = clone $this->product;
         $this->productThird->setId(null)
             ->setUrlKey('product-third')
+            ->setIsDuplicate(true)
             ->setData('test_attribute', 'NO_test_attribute_value')
             ->save();
     }