diff --git a/src/Entity/StructuralDBElement.php b/src/Entity/StructuralDBElement.php
index d1fa2063..d3e9e0c1 100644
--- a/src/Entity/StructuralDBElement.php
+++ b/src/Entity/StructuralDBElement.php
@@ -26,6 +26,7 @@ namespace App\Entity;
 use Doctrine\ORM\Mapping as ORM;
 use Doctrine\ORM\PersistentCollection;
 use App\Validator\Constraints\NoneOfItsChildren;
+use Symfony\Bridge\Doctrine\Validator\Constraints\UniqueEntity;
 
 /**
  * All elements with the fields "id", "name" and "parent_id" (at least).
@@ -37,6 +38,8 @@ use App\Validator\Constraints\NoneOfItsChildren;
  * an attribute of a root element, you will get an exception!
  *
  * @ORM\MappedSuperclass(repositoryClass="App\Repository\StructuralDBElementRepository")
+ *
+ * @UniqueEntity(fields={"name", "parent"}, ignoreNull=false, message="structural.entity.unique_name")
  */
 abstract class StructuralDBElement extends AttachmentContainingDBElement
 {
diff --git a/translations/validators.de.xlf b/translations/validators.de.xlf
new file mode 100644
index 00000000..315ee38f
--- /dev/null
+++ b/translations/validators.de.xlf
@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="utf-8"?>
+<xliff xmlns="urn:oasis:names:tc:xliff:document:2.0" version="2.0" srcLang="en" trgLang="de">
+  <file id="validators.de">
+    <unit id="VJHTkxx" name="structural.entity.unique_name">
+      <segment>
+        <source>structural.entity.unique_name</source>
+        <target>Es kann auf jeder Ebene nur ein Objekt mit dem gleichem Namen geben!</target>
+      </segment>
+    </unit>
+  </file>
+</xliff>