diff --git a/src/Entity/Constructeur.php b/src/Entity/Constructeur.php
index 16b81c2..2bc9d1f 100644
--- a/src/Entity/Constructeur.php
+++ b/src/Entity/Constructeur.php
@@ -17,7 +17,9 @@ use Doctrine\Common\Collections\ArrayCollection;
 use Doctrine\Common\Collections\Collection;
 use Doctrine\DBAL\Types\Types;
 use Doctrine\ORM\Mapping as ORM;
+use Symfony\Bridge\Doctrine\Validator\Constraints\UniqueEntity;
 
+#[UniqueEntity(fields: ['name'], message: 'Un fournisseur avec ce nom existe déjà.')]
 #[ORM\Entity(repositoryClass: ConstructeurRepository::class)]
 #[ORM\Table(name: 'constructeurs')]
 #[ORM\HasLifecycleCallbacks]
diff --git a/src/Entity/Piece.php b/src/Entity/Piece.php
index adf3b6f..88b5f7f 100644
--- a/src/Entity/Piece.php
+++ b/src/Entity/Piece.php
@@ -20,8 +20,10 @@ use Doctrine\Common\Collections\ArrayCollection;
 use Doctrine\Common\Collections\Collection;
 use Doctrine\DBAL\Types\Types;
 use Doctrine\ORM\Mapping as ORM;
+use Symfony\Bridge\Doctrine\Validator\Constraints\UniqueEntity;
 use Symfony\Component\Serializer\Attribute\Groups;
 
+#[UniqueEntity(fields: ['reference'], message: 'Une pièce avec cette référence existe déjà.')]
 #[ORM\Entity(repositoryClass: PieceRepository::class)]
 #[ORM\Table(name: 'pieces')]
 #[ORM\HasLifecycleCallbacks]
@@ -47,11 +49,11 @@ class Piece
     #[Groups(['piece:read', 'document:list'])]
     private ?string $id = null;
 
-    #[ORM\Column(type: Types::STRING, length: 255, unique: true)]
+    #[ORM\Column(type: Types::STRING, length: 255)]
     #[Groups(['piece:read', 'document:list'])]
     private string $name;
 
-    #[ORM\Column(type: Types::STRING, length: 255, nullable: true)]
+    #[ORM\Column(type: Types::STRING, length: 255, unique: true, nullable: true)]
     #[Groups(['piece:read'])]
     private ?string $reference = null;