diff --git a/application/src/Entity/AbstractEntity.php b/application/src/Entity/AbstractEntity.php
index c6541cf..9ce9dc8 100644
--- a/application/src/Entity/AbstractEntity.php
+++ b/application/src/Entity/AbstractEntity.php
@@ -1,18 +1,20 @@
 <?php
-
 namespace App\Entity;
 
 use App\Entity\Attribut\IdAttribut;
 use Doctrine\ORM\Mapping as ORM;
+use App\Entity\Attribut\VersionAttribut;
 
 /**
+ *
  * @author kevinfrantz
  */
 abstract class AbstractEntity implements EntityInterface
 {
-    use IdAttribut;
+    use IdAttribut, VersionAttribut;
 
     /**
+     *
      * @ORM\Id()
      * @ORM\GeneratedValue
      * @ORM\Column(type="integer")(strategy="AUTO")
@@ -21,8 +23,15 @@ abstract class AbstractEntity implements EntityInterface
      */
     protected $id;
 
+    /**
+     *
+     * @version @ORM\Column(type="integer")
+     * @var int
+     */
+    protected $version;
+
     public function __construct()
     {
-        //$this->id = 0;
+        // $this->id = 0;
     }
 }
diff --git a/application/src/Entity/Attribut/VersionAttribut.php b/application/src/Entity/Attribut/VersionAttribut.php
new file mode 100644
index 0000000..eb7b82b
--- /dev/null
+++ b/application/src/Entity/Attribut/VersionAttribut.php
@@ -0,0 +1,25 @@
+<?php
+namespace App\Entity\Attribut;
+
+/**
+ *
+ * @author kevinfrantz
+ *        
+ */
+trait VersionAttribut
+{
+    /**
+     * 
+     * @var int
+     */
+    protected $version;
+    
+    public function setVersion(int $version):void{
+        $this->version = $version;
+    }
+    
+    public function getVersion():int{
+        return $this->version;
+    }
+}
+
diff --git a/application/src/Entity/Attribut/VersionAttributInterface.php b/application/src/Entity/Attribut/VersionAttributInterface.php
new file mode 100644
index 0000000..764d232
--- /dev/null
+++ b/application/src/Entity/Attribut/VersionAttributInterface.php
@@ -0,0 +1,24 @@
+<?php
+namespace App\Entity\Attribut;
+
+/**
+ * Entities which implement this interface can lock stuff on an optimistic base. 
+ * @see https://www.doctrine-project.org/projects/doctrine-orm/en/2.6/reference/transactions-and-concurrency.html
+ * @see https://en.wikipedia.org/wiki/Optimistic_concurrency_control
+ * @author kevinfrantz
+ */
+interface VersionAttributInterface
+{
+    /**
+     * Returns the revision version of the entity
+     * @return int
+     */
+    public function getVersion():int;
+    
+    /**
+     * Sets the revision version of the entity
+     * @param int $version
+     */
+    public function setVersion(int $version):void;
+}
+
diff --git a/application/src/Entity/EntityInterface.php b/application/src/Entity/EntityInterface.php
index 46f551b..aa2f183 100644
--- a/application/src/Entity/EntityInterface.php
+++ b/application/src/Entity/EntityInterface.php
@@ -1,12 +1,15 @@
 <?php
 namespace App\Entity;
 
+use App\Entity\Attribut\VersionAttributInterface;
+use App\Entity\Attribut\IdAttributInterface;
+
 /**
  *
  * @author kevinfrantz
  *        
  */
-interface EntityInterface
+interface EntityInterface extends VersionAttributInterface, IdAttributInterface
 {
 }
 
diff --git a/application/src/Entity/User.php b/application/src/Entity/User.php
index 08f5876..12fd8a4 100644
--- a/application/src/Entity/User.php
+++ b/application/src/Entity/User.php
@@ -9,6 +9,7 @@ use App\Entity\Attribut\IdAttribut;
 use App\Creator\Modificator\Entity\LawModificator;
 use App\Entity\Source\UserSourceInterface;
 use App\Entity\Source\UserSource;
+use App\Entity\Attribut\VersionAttribut;
 
 /**
  * @author kevinfrantz
@@ -17,7 +18,7 @@ use App\Entity\Source\UserSource;
  */
 class User extends BaseUser implements UserInterface
 {
-    use SourceAttribut,IdAttribut;
+    use SourceAttribut,IdAttribut, VersionAttribut;
 
     /**
      * @var UserSourceInterface
@@ -37,6 +38,13 @@ class User extends BaseUser implements UserInterface
      * @ORM\Column(type="integer")(strategy="AUTO")
      */
     protected $id;
+    
+    /**
+     *
+     * @version @ORM\Column(type="integer")
+     * @var int
+     */
+    protected $version;
 
     public function __construct()
     {
diff --git a/application/src/Entity/UserInterface.php b/application/src/Entity/UserInterface.php
index 919f5e5..3471b4c 100644
--- a/application/src/Entity/UserInterface.php
+++ b/application/src/Entity/UserInterface.php
@@ -3,13 +3,13 @@ namespace App\Entity;
 
 use FOS\UserBundle\Model\UserInterface as FOSUserInterface;
 use App\Entity\Attribut\SourceAttributInterface;
+use App\Entity\Attribut\VersionAttributInterface;
 
 /**
- *
  * @author kevinfrantz
  *        
  */
-interface UserInterface extends FOSUserInterface, SourceAttributInterface
+interface UserInterface extends FOSUserInterface, SourceAttributInterface, VersionAttributInterface
 {
     
 }
\ No newline at end of file
diff --git a/application/src/Structur/Facade/Security/Source/UserSourceFacade.php b/application/src/Structur/Facade/Security/Source/UserSourceFacade.php
index ba5fee8..207d7da 100644
--- a/application/src/Structur/Facade/Security/Source/UserSourceFacade.php
+++ b/application/src/Structur/Facade/Security/Source/UserSourceFacade.php
@@ -1,5 +1,4 @@
 <?php
-
 namespace App\Structur\Facade\Security\Source;
 
 use App\Entity\Source\NameSourceInterface;
@@ -9,11 +8,14 @@ use App\DBAL\Types\RightType;
 use App\DBAL\Types\LayerType;
 
 /**
+ *
  * @author kevinfrantz
  */
 class UserSourceFacade extends AbstractSourceFacade implements UserSourceInterface
 {
+
     /**
+     *
      * @var UserSourceInterface
      */
     protected $source;
@@ -26,7 +28,7 @@ class UserSourceFacade extends AbstractSourceFacade implements UserSourceInterfa
     public function getNameSource(): NameSourceInterface
     {
         if ($this->isNameSourceGranted(RightType::READ, LayerType::SOURCE)) {
-            //FILL! :)
+            // FILL! :)
         }
     }
 
@@ -38,10 +40,26 @@ class UserSourceFacade extends AbstractSourceFacade implements UserSourceInterfa
 
         return $this->isGranted($right, $layer) && $law->isGranted($userSourceNode, $layer, $right);
     }
+
     public function getUser(): UserInterface
     {}
 
     public function setUser(UserInterface $user): void
     {}
 
+    public function getVersion(): int
+    {
+    /**
+     *
+     * @todo Implement
+     */
+    }
+
+    public function setVersion(int $version): void
+    {
+    /**
+     *
+     * @todo Implement
+     */
+    }
 }