diff --git a/lib/Doctrine/ORM/UnitOfWork.php b/lib/Doctrine/ORM/UnitOfWork.php
index 1f5f5158b..1d989031c 100644
--- a/lib/Doctrine/ORM/UnitOfWork.php
+++ b/lib/Doctrine/ORM/UnitOfWork.php
@@ -2510,15 +2510,15 @@ class UnitOfWork implements PropertyChangedListener
                     ? $data[$class->associationMappings[$fieldName]['joinColumns'][0]['name']]
                     : $data[$fieldName];
             }
-
-            $idHash = implode(' ', $id);
         } else {
-            $idHash = isset($class->associationMappings[$class->identifier[0]])
+            $id = isset($class->associationMappings[$class->identifier[0]])
                 ? $data[$class->associationMappings[$class->identifier[0]]['joinColumns'][0]['name']]
                 : $data[$class->identifier[0]];
 
-            $id = array($class->identifier[0] => $idHash);
+            $id = array($class->identifier[0] => $id);
         }
+        
+        $idHash = implode(' ', $id);
 
         if (isset($this->identityMap[$class->rootEntityName][$idHash])) {
             $entity = $this->identityMap[$class->rootEntityName][$idHash];
diff --git a/tests/Doctrine/Tests/ORM/Functional/Ticket/DDC2984Test.php b/tests/Doctrine/Tests/ORM/Functional/Ticket/DDC2984Test.php
new file mode 100644
index 000000000..19439c143
--- /dev/null
+++ b/tests/Doctrine/Tests/ORM/Functional/Ticket/DDC2984Test.php
@@ -0,0 +1,199 @@
+<?php
+
+namespace Doctrine\Tests\ORM\Functional\Ticket;
+
+use Doctrine\DBAL\Platforms\AbstractPlatform;
+use Doctrine\DBAL\Types\ConversionException;
+use Doctrine\DBAL\Types\StringType;
+use Doctrine\DBAL\Types\Type;
+
+/**
+ * @group DDC-2984
+ */
+class DDC2984Test extends \Doctrine\Tests\OrmFunctionalTestCase
+{
+    public function setUp()
+    {
+        parent::setUp();
+        
+        if ( ! Type::hasType('ddc2984_domain_user_id')) {
+            Type::addType(
+                'ddc2984_domain_user_id', 
+                __NAMESPACE__ . '\DDC2984UserIdCustomDbalType'
+            );
+        }
+
+        try {
+            $this->_schemaTool->createSchema(array(
+                $this->_em->getClassMetadata(__NAMESPACE__ . '\DDC2984User'),
+            ));
+        } catch (\Exception $e) {
+            // no action needed - schema seems to be already in place
+        }
+    }
+
+    public function testIssue()
+    {
+        $user = new DDC2984User(new DDC2984DomainUserId('unique_id_within_a_vo'));
+        $user->applyName('Alex');
+        
+        $this->_em->persist($user);
+        $this->_em->flush($user);
+        
+        $repository = $this->_em->getRepository(__NAMESPACE__ . "\DDC2984User");
+
+        $sameUser = $repository->find(new DDC2984DomainUserId('unique_id_within_a_vo'));
+
+        //Until know, everything works as expected
+        $this->assertTrue($user->sameIdentityAs($sameUser));
+
+        $this->_em->clear();
+
+        //After clearing the identity map, the UnitOfWork produces the warning described in DDC-2984
+        $equalUser = $repository->find(new DDC2984DomainUserId('unique_id_within_a_vo'));
+
+        $this->assertNotSame($user, $equalUser);
+        $this->assertTrue($user->sameIdentityAs($equalUser));
+    }
+}
+
+/** @Entity @Table(name="users") */
+class DDC2984User
+{
+    /**
+     * @Id @Column(type="ddc2984_domain_user_id")
+     * @GeneratedValue(strategy="NONE")
+     *
+     * @var DDC2984DomainUserId
+     */
+    private $userId;
+
+    /** @Column(type="string", length=50) */
+    private $name;
+
+    public function __construct(DDC2984DomainUserId $aUserId)
+    {
+        $this->userId = $aUserId;
+    }
+
+    /**
+     * @return DDC2984DomainUserId
+     */
+    public function userId()
+    {
+        return $this->userId;
+    }
+
+    /**
+     * @return string
+     */
+    public function name()
+    {
+        return $this->name;
+    }
+
+    /**
+     * @param string $name
+     */
+    public function applyName($name)
+    {
+        $this->name = $name;
+    }
+
+    /**
+     * @param DDC2984User $other
+     * @return bool
+     */
+    public function sameIdentityAs(DDC2984User $other)
+    {
+        return $this->userId()->sameValueAs($other->userId());
+    }
+}
+
+/**
+ * DDC2984DomainUserId ValueObject
+ *
+ * @author Alexander Miertsch <kontakt@codeliner.ws>
+ */
+class DDC2984DomainUserId
+{
+    /**
+     * @var string
+     */
+    private $userIdString;
+
+    /**
+     * @param string $aUserIdString
+     */
+    public function __construct($aUserIdString)
+    {
+        $this->userIdString = $aUserIdString;
+    }
+
+    /**
+     * @return string
+     */
+    public function toString()
+    {
+        return $this->userIdString;
+    }
+
+    /**
+     * @return string
+     */
+    public function __toString()
+    {
+        return $this->toString();
+    }
+
+    /**
+     * @param DDC2984DomainUserId $other
+     * @return bool
+     */
+    public function sameValueAs(DDC2984DomainUserId $other)
+    {
+        return $this->toString() === $other->toString();
+    }
+} 
+
+/**
+ * Class DDC2984UserIdCustomDbalType
+ *
+ * @author Alexander Miertsch <kontakt@codeliner.ws>
+ */
+class DDC2984UserIdCustomDbalType extends StringType
+{
+    public function getName()
+    {
+        return 'ddc2984_domain_user_id';
+    }
+    /**
+     * {@inheritDoc}
+     */
+    public function convertToPHPValue($value, AbstractPlatform $platform)
+    {
+        return ! empty($value)
+            ? new DDC2984DomainUserId($value)
+            : null;
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public function convertToDatabaseValue($value, AbstractPlatform $platform)
+    {
+        if (empty($value)) {
+            return null;
+        }
+
+        if (is_string($value)) {
+            return $value;
+        }
+
+        if ( ! $value instanceof DDC2984DomainUserId) {
+            throw ConversionException::conversionFailed($value, $this->getName());
+        }
+
+        return $value->toString();
+    }
+} 
\ No newline at end of file
diff --git a/tests/Doctrine/Tests/ORM/Functional/Ticket/DDC742Test.php b/tests/Doctrine/Tests/ORM/Functional/Ticket/DDC742Test.php
index 6c3b8f1fa..ad4fad95b 100644
--- a/tests/Doctrine/Tests/ORM/Functional/Ticket/DDC742Test.php
+++ b/tests/Doctrine/Tests/ORM/Functional/Ticket/DDC742Test.php
@@ -79,7 +79,7 @@ class DDC742Test extends \Doctrine\Tests\OrmFunctionalTestCase
 
 /**
  * @Entity
- * @Table(name="users")
+ * @Table(name="ddc742_users")
  */
 class DDC742User
 {
@@ -112,7 +112,7 @@ class DDC742User
 
 /**
  * @Entity
- * @Table(name="comments")
+ * @Table(name="ddc742_comments")
  */
 class DDC742Comment
 {