diff --git a/CHANGELOG.md b/CHANGELOG.md
index c25452a5..f3456104 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,12 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](http://keepachangelog.com/)
 and this project adheres to [Semantic Versioning](http://semver.org/).
 
+## [Unreleased]
+
+### Fixed
+
+- Fixed a bug that prevented the creation of additional field data for objects
+
 ## [1.23.0] - 2025-11-05
 
 ### Added
diff --git a/inc/abstractcontainerinstance.class.php b/inc/abstractcontainerinstance.class.php
index 3a6a875d..c538b373 100644
--- a/inc/abstractcontainerinstance.class.php
+++ b/inc/abstractcontainerinstance.class.php
@@ -33,8 +33,6 @@ abstract class PluginFieldsAbstractContainerInstance extends CommonDBChild
     public static $itemtype = 'itemtype';
     public static $items_id = 'items_id';
 
-    public static $mustBeAttached     = false;
-
     /**
      * This function relies on the static property `static::$plugins_forward_entity`,
      * which should be populated using the following method (from setup):
diff --git a/inc/container.class.php b/inc/container.class.php
index b457c792..9d9c445f 100644
--- a/inc/container.class.php
+++ b/inc/container.class.php
@@ -1745,6 +1745,7 @@ public static function postItemAdd(CommonDBTM $item)
     {
         if (array_key_exists('_plugin_fields_data', $item->input)) {
             $data             = $item->input['_plugin_fields_data'];
+            $data['itemtype'] = $item::class;
             $data['items_id'] = $item->getID();
             $data['entities_id'] = $item->isEntityAssign() ? $item->getEntityID() : 0;
             //update data