diff --git a/src/Entity/MissionCategory.php b/src/Entity/MissionCategory.php
index 862d5a8..ea5680d 100644
--- a/src/Entity/MissionCategory.php
+++ b/src/Entity/MissionCategory.php
@@ -5,17 +5,18 @@ namespace App\Entity;
 use App\Repository\MissionCategoryRepository;
 use Doctrine\ORM\Mapping as ORM;
 
-#[ORM\Entity(repositoryClass: MissionCategoryRepository::class)]
+#[ORM\Entity]
+#[ORM\UniqueConstraint(columns: ['mission', 'category'])]
 class MissionCategory
 {
     #[ORM\Id]
-    #[ORM\OneToMany(targetEntity: Mission::class, mappedBy: 'MissionCategory')]
-    #[ORM\JoinColumn(nullable: false)]
+    #[ORM\ManyToOne(targetEntity: Mission::class, inversedBy: 'missionCategories')]
+    #[ORM\Column(type: 'integer')]
     private ?Mission $mission = null;
 
     #[ORM\Id]
-    #[ORM\OneToMany(targetEntity: Category::class, mappedBy: 'MissionCategory')]
-    #[ORM\JoinColumn(nullable: false)]
+    #[ORM\ManyToOne(targetEntity: Category::class, inversedBy: 'missionCategories')]
+    #[ORM\Column(type: 'integer')]
     private ?Category $category = null;
 
     public function getMission(): ?Mission