diff --git a/main/gradebook/lib/be/category.class.php b/main/gradebook/lib/be/category.class.php
index d8d0fcbdbe..c925de2b35 100755
--- a/main/gradebook/lib/be/category.class.php
+++ b/main/gradebook/lib/be/category.class.php
@@ -2163,10 +2163,6 @@ class Category implements GradebookItem
         if ($skillToolEnabled) {
             $skill = new Skill();
             $objSkillRelUser = new SkillRelUser();
-
-            // It cleans the previous results to generate the new user skills
-            $objSkillRelUser->deleteUserSkill($user_id, $courseId, $sessionId);
-
             $skill->addSkillToUser(
                 $user_id,
                 $category,
diff --git a/main/install/configuration.dist.php b/main/install/configuration.dist.php
index 744e399b9f..a8c1e1298b 100755
--- a/main/install/configuration.dist.php
+++ b/main/install/configuration.dist.php
@@ -2216,7 +2216,6 @@ INSERT INTO `extra_field` (`extra_field_type`, `field_type`, `variable`, `displa
 // Require DB changes:
 // ALTER TABLE gradebook_category ADD allow_skills_by_subcategory tinyint(1) NULL DEFAULT '1';
 // Requires edit Entity GradebookCategory: src/Chamilo/CoreBundle/Entity/GradebookCategory.php uncomment "allowSkillsBySubcategory" variable.
-// Requires uncomment the allowSkillsBySubcategory get and set
 //$_configuration['gradebook_enable_subcategory_skills_independant_assignement'] = false;
 
 // Shows the deleted quizzes in my progress page.
diff --git a/src/Chamilo/CoreBundle/Entity/GradebookCategory.php b/src/Chamilo/CoreBundle/Entity/GradebookCategory.php
index 6d9884459c..311c7831d8 100644
--- a/src/Chamilo/CoreBundle/Entity/GradebookCategory.php
+++ b/src/Chamilo/CoreBundle/Entity/GradebookCategory.php
@@ -514,20 +514,20 @@ class GradebookCategory
     /**
      * @return int
      */
-    /*public function getAllowSkillsBySubcategory()
+    public function getAllowSkillsBySubcategory()
     {
         return $this->allowSkillsBySubcategory;
-    }*/
+    }
 
     /**
      * @param int $allowSkillsBySubcategory
      *
      * @return GradebookCategory
      */
-    /*public function setAllowSkillsBySubcategory($allowSkillsBySubcategory)
+    public function setAllowSkillsBySubcategory($allowSkillsBySubcategory)
     {
         $this->allowSkillsBySubcategory = $allowSkillsBySubcategory;
 
         return $this;
-    }*/
+    }
 }