Merge magento-partners/magento2ce#80.

Author: Volodymyr Kublytskyi

app/code/Magento/Catalog/Model/Product/Option/Value.php

@@ -189,7 +189,8 @@ public function getProduct()
      */
     public function saveValues()
     {
-        foreach ($this->getValues() as $value) {
+        foreach ($this->getValues() as $value) 
+            $this->isDeleted(false);
             $this->setData(
                 $value
             )->setData(