diff --git a/src/CoreBundle/Entity/AccessUrlRelCourse.php b/src/CoreBundle/Entity/AccessUrlRelCourse.php
index 637ed5f961..f906887c6e 100644
--- a/src/CoreBundle/Entity/AccessUrlRelCourse.php
+++ b/src/CoreBundle/Entity/AccessUrlRelCourse.php
@@ -25,11 +25,11 @@ class AccessUrlRelCourse implements EntityAccessUrlInterface, Stringable
     protected ?int $id = null;
 
     #[ORM\ManyToOne(targetEntity: Course::class, cascade: ['persist'], inversedBy: 'urls')]
-    #[ORM\JoinColumn(name: 'c_id', referencedColumnName: 'id')]
-    protected Course $course;
+    #[ORM\JoinColumn(name: 'c_id', referencedColumnName: 'id', nullable: false, onDelete: "CASCADE")]
+    protected ?Course $course;
 
     #[ORM\ManyToOne(targetEntity: AccessUrl::class, cascade: ['persist'], inversedBy: 'courses')]
-    #[ORM\JoinColumn(name: 'access_url_id', referencedColumnName: 'id')]
+    #[ORM\JoinColumn(name: 'access_url_id', referencedColumnName: 'id', nullable: false, onDelete: "CASCADE")]
     protected ?AccessUrl $url;
 
     public function __toString(): string
@@ -54,7 +54,7 @@ class AccessUrlRelCourse implements EntityAccessUrlInterface, Stringable
         return $this;
     }
 
-    public function getCourse(): Course
+    public function getCourse(): ?Course
     {
         return $this->course;
     }
diff --git a/src/CoreBundle/Entity/Course.php b/src/CoreBundle/Entity/Course.php
index 8889e06801..8a26b40852 100644
--- a/src/CoreBundle/Entity/Course.php
+++ b/src/CoreBundle/Entity/Course.php
@@ -164,7 +164,8 @@ class Course extends AbstractResource implements
         cascade: [
             'persist',
             'remove',
-        ]
+        ],
+        orphanRemoval: true
     )]
     protected Collection $tools;
 
diff --git a/src/CoreBundle/Entity/CourseRelUser.php b/src/CoreBundle/Entity/CourseRelUser.php
index 910a85c4a7..c0d8130ee0 100644
--- a/src/CoreBundle/Entity/CourseRelUser.php
+++ b/src/CoreBundle/Entity/CourseRelUser.php
@@ -68,7 +68,7 @@ class CourseRelUser implements Stringable
 
     #[Groups(['course_rel_user:read'])]
     #[ORM\ManyToOne(targetEntity: Course::class, inversedBy: 'users', cascade: ['persist'])]
-    #[ORM\JoinColumn(name: 'c_id', referencedColumnName: 'id')]
+    #[ORM\JoinColumn(name: 'c_id', referencedColumnName: 'id', onDelete: "CASCADE")]
     protected Course $course;
 
     #[Groups(['course:read', 'user:read'])]
diff --git a/src/CoreBundle/Migrations/Schema/V200/Version20230824115700.php b/src/CoreBundle/Migrations/Schema/V200/Version20230824115700.php
new file mode 100644
index 0000000000..713571ee51
--- /dev/null
+++ b/src/CoreBundle/Migrations/Schema/V200/Version20230824115700.php
@@ -0,0 +1,50 @@
+<?php
+
+namespace Chamilo\CoreBundle\Migrations\Schema\V200;
+
+use Chamilo\CoreBundle\Migrations\AbstractMigrationChamilo;
+use Doctrine\DBAL\Schema\Schema;
+
+class Version20230824115700 extends AbstractMigrationChamilo
+{
+    public function getDescription(): string
+    {
+        return 'Changes in Course dependent tables';
+    }
+
+    /**
+     * @inheritDoc
+     */
+    public function up(Schema $schema): void
+    {
+        $accessUrlRelCourse = $schema->getTable('access_url_rel_course');
+
+        if ($accessUrlRelCourse->hasForeignKey('FK_8E97FC0891D79BD3')) {
+            $this->addSql('ALTER TABLE access_url_rel_course DROP FOREIGN KEY FK_8E97FC0891D79BD3');
+        }
+
+        if ($accessUrlRelCourse->hasForeignKey('FK_8E97FC0873444FD5')) {
+            $this->addSql('ALTER TABLE access_url_rel_course DROP FOREIGN KEY FK_8E97FC0873444FD5');
+        }
+
+        $this->addSql('ALTER TABLE access_url_rel_course CHANGE c_id c_id INT NOT NULL, CHANGE access_url_id access_url_id INT NOT NULL');
+        $this->addSql('ALTER TABLE access_url_rel_course ADD CONSTRAINT FK_8E97FC0891D79BD3 FOREIGN KEY (c_id) REFERENCES course (id) ON DELETE CASCADE');
+        $this->addSql('ALTER TABLE access_url_rel_course ADD CONSTRAINT FK_8E97FC0873444FD5 FOREIGN KEY (access_url_id) REFERENCES access_url (id) ON DELETE CASCADE');
+
+        $courseRelUser = $schema->getTable('course_rel_user');
+
+        if ($courseRelUser->hasForeignKey('FK_92CFD9FE91D79BD3')) {
+            $this->addSql('ALTER TABLE course_rel_user DROP FOREIGN KEY FK_92CFD9FE91D79BD3');
+        }
+
+        $this->addSql('ALTER TABLE course_rel_user ADD CONSTRAINT FK_92CFD9FE91D79BD3 FOREIGN KEY (c_id) REFERENCES course (id) ON DELETE CASCADE');
+
+        $cTool = $schema->getTable('c_tool');
+
+        if ($cTool->hasForeignKey('FK_8456658091D79BD3')) {
+            $this->addSql('ALTER TABLE c_tool DROP FOREIGN KEY FK_8456658091D79BD3');
+        }
+
+        $this->addSql('ALTER TABLE c_tool ADD CONSTRAINT FK_8456658091D79BD3 FOREIGN KEY (c_id) REFERENCES course (id) ON DELETE CASCADE');
+    }
+}
\ No newline at end of file
diff --git a/src/CourseBundle/Entity/CTool.php b/src/CourseBundle/Entity/CTool.php
index 02a16f7491..5ec7f55680 100644
--- a/src/CourseBundle/Entity/CTool.php
+++ b/src/CourseBundle/Entity/CTool.php
@@ -50,7 +50,7 @@ class CTool extends AbstractResource implements
     protected ?bool $visibility = null;
 
     #[ORM\ManyToOne(targetEntity: Course::class, inversedBy: 'tools')]
-    #[ORM\JoinColumn(name: 'c_id', referencedColumnName: 'id', nullable: false)]
+    #[ORM\JoinColumn(name: 'c_id', referencedColumnName: 'id', nullable: false, onDelete: "CASCADE")]
     #[Gedmo\SortableGroup]
     protected Course $course;