diff --git a/core/cmdbchange.class.inc.php b/core/cmdbchange.class.inc.php
index aea63d58b..fdbaba9eb 100644
--- a/core/cmdbchange.class.inc.php
+++ b/core/cmdbchange.class.inc.php
@@ -52,7 +52,7 @@ class CMDBChange extends DBObject
 		//MetaModel::Init_InheritAttributes();
 		MetaModel::Init_AddAttribute(new AttributeDateTime("date", array("allowed_values"=>null, "sql"=>"date", "default_value"=>"", "is_null_allowed"=>false, "depends_on"=>array())));
 		MetaModel::Init_AddAttribute(new AttributeString("userinfo", array("allowed_values"=>null, "sql"=>"userinfo", "default_value"=>null, "is_null_allowed"=>true, "depends_on"=>array())));
-		MetaModel::Init_AddAttribute(new AttributeInteger("user_id", array("allowed_values" => null, "sql" => "user_id", "default_value" => null, "is_null_allowed" => true, "depends_on" => array(),)));
+		MetaModel::Init_AddAttribute(new AttributeExternalKey("user_id", array("allowed_values"=>null, "sql"=>"user_id", "targetclass"=>"User", "is_null_allowed"=>true, "on_target_delete"=>DEL_MANUAL, "depends_on"=>array())));
 		MetaModel::Init_AddAttribute(new AttributeEnum("origin", array("allowed_values"=>new ValueSetEnum('interactive,csv-interactive,csv-import.php,webservice-soap,webservice-rest,synchro-data-source,email-processing,custom-extension'), "sql"=>"origin", "default_value"=>"interactive", "is_null_allowed"=>true, "depends_on"=>array())));
 	}