diff --git a/src/Entity/PriceInformations/Orderdetail.php b/src/Entity/PriceInformations/Orderdetail.php
index 84999672..0524316b 100644
--- a/src/Entity/PriceInformations/Orderdetail.php
+++ b/src/Entity/PriceInformations/Orderdetail.php
@@ -59,6 +59,7 @@ use App\Entity\Parts\Supplier;
 use Doctrine\Common\Collections\ArrayCollection;
 use Doctrine\Common\Collections\Collection;
 use Doctrine\ORM\Mapping as ORM;
+use Symfony\Bridge\Doctrine\Validator\Constraints\UniqueEntity;
 use Symfony\Component\Validator\Constraints as Assert;
 
 /**
@@ -67,6 +68,7 @@ use Symfony\Component\Validator\Constraints as Assert;
  * @ORM\Table("`orderdetails`")
  * @ORM\Entity()
  * @ORM\HasLifecycleCallbacks()
+ * @UniqueEntity({"supplierpartnr", "supplier", "part"})
  */
 class Orderdetail extends AbstractDBElement implements TimeStampableInterface, NamedElementInterface
 {