Started trying to reproduce this issue

tests/Doctrine/Tests/ORM/Functional/Ticket/DDC1238Test.php

@@ -0,0 +1,89 @@
+<?php
+
+namespace Doctrine\Tests\ORM\Functional\Ticket;
+
+use Doctrine\Common\Collections\ArrayCollection;
+use Doctrine\Tests\Models\CMS\CmsEmployee;
+
+require_once __DIR__ . '/../../../TestInit.php';
+
+/**
+ * @group DDC-1238
+ */
+class DDC1238Test extends \Doctrine\Tests\OrmFunctionalTestCase
+{
+    public function setUp()
+    {
+        parent::setUp();
+        try {
+            $this->_schemaTool->createSchema(array(
+                $this->_em->getClassMetadata(__NAMESPACE__ . '\\DDC1238User'),
+                #$this->_em->getClassMetadata(__NAMESPACE__ . '\\DDC1238UserBase'),
+                $this->_em->getClassMetadata(__NAMESPACE__ . '\\DDC1238UserSuperClass'),
+            ));
+        } catch(\PDOException $e) {
+            
+        }
+    }
+    
+    public function testIssue()
+    {
+        $user = new DDC1238User;
+        $user->setName("test");
+        
+        $this->_em->persist($user);
+        $this->_em->flush();
+        $this->_em->clear();
+        
+        for ($i = 0; $i < 5; $i++) {
+            $user = $this->_em->getReference(__NAMESPACE__ . '\\DDC1238User', $user->getId());
+        }
+        
+        $this->assertInstanceOf(__NAMESPACE__ . '\\DDC1238User', $user);
+    }
+}
+
+/**
+ * @MappedSuperclass
+ */
+abstract class DDC1238UserSuperClass
+{
+    /**
+     * @Column
+     * @var string
+     */
+    private $name;
+    
+    public function getName()
+    {
+        return $this->name;
+    }
+
+    public function setName($name)
+    {
+        $this->name = $name;
+    }
+}
+
+/**
+ * nothing
+ */
+abstract class DDC1238UserBase extends DDC1238UserSuperClass
+{
+    
+}
+
+/**
+ * @Entity
+ */
+class DDC1238User extends DDC1238UserBase
+{
+    /** @Id @GeneratedValue @Column(type="integer") */
+    private $id;
+    
+    public function getId()
+    {
+        return $this->id;
+    }
+}
+