diff --git a/inc/questionparameter.class.php b/inc/questionparameter.class.php
index d25806cc3..8b9497ca0 100644
--- a/inc/questionparameter.class.php
+++ b/inc/questionparameter.class.php
@@ -80,4 +80,15 @@ public function prepareInputforAdd($input) {
 
       return $input;
    }
+
+   public function deleteObsoleteItems(CommonDBTM $container, array $exclude)
+   {
+      $keepCriteria = [
+         self::$items_id => $container->getID(),
+      ];
+      if (count($exclude) > 0) {
+         $keepCriteria[] = ['NOT' => ['id' => $exclude]];
+      }
+      return $this->deleteByCriteria($keepCriteria);
+   }
 }