diff --git a/src/Entity/PriceInformations/Orderdetail.php b/src/Entity/PriceInformations/Orderdetail.php
index ccf0fb1e..150c9dd1 100644
--- a/src/Entity/PriceInformations/Orderdetail.php
+++ b/src/Entity/PriceInformations/Orderdetail.php
@@ -113,6 +113,7 @@ class Orderdetail extends AbstractDBElement implements TimeStampableInterface, N
      * @var Supplier
      * @ORM\ManyToOne(targetEntity="App\Entity\Parts\Supplier", inversedBy="orderdetails")
      * @ORM\JoinColumn(name="id_supplier", referencedColumnName="id")
+     * @Assert\NotNull(message="validator.orderdetail.supplier_must_not_be_null")
      */
     protected $supplier;
 
diff --git a/translations/validators.en.xlf b/translations/validators.en.xlf
index 8ecde9ad..9f81c4d0 100644
--- a/translations/validators.en.xlf
+++ b/translations/validators.en.xlf
@@ -221,5 +221,11 @@
         <target>You must select an attachment type!</target>
       </segment>
     </unit>
+    <unit id="cDDVrWT" name="validator.orderdetail.supplier_must_not_be_null">
+      <segment>
+        <source>validator.orderdetail.supplier_must_not_be_null</source>
+        <target>You must select an supplier!</target>
+      </segment>
+    </unit>
   </file>
 </xliff>