diff --git a/studies_base/models/study_questionnaire.py b/studies_base/models/study_questionnaire.py
index b52321e..4062d53 100644
--- a/studies_base/models/study_questionnaire.py
+++ b/studies_base/models/study_questionnaire.py
@@ -16,7 +16,7 @@ class StudyQuestionnaire(models.Model):
     effective_period_end = fields.Datetime("Fin de la collecte")
 
     purpose = fields.Text("Objectif")
-    subject_type = fields.Many2one("study.questionnaire.subject.type", string="Sujets")
+    subject_type = fields.Many2many("study.questionnaire.subject.type", string="Sujets")
     description = fields.Text("Description du questionnaire")
 
     jurisdiction = fields.Many2many("study.region", string="Zones géographiques ciblées")
@@ -29,4 +29,7 @@ class StudyQuestionnaire(models.Model):
     identifier_primary_id = fields.Char("Identifiant Seintinelles", readonly=True)
 
     copyright = fields.Text("Copyright")
-    copyright_label = fields.Char("Propriétaire et année du copyright")
\ No newline at end of file
+    copyright_label = fields.Char("Propriétaire et année du copyright")
+
+    created = fields.Datetime("Created")
+    date = fields.Datetime("Date")
\ No newline at end of file
diff --git a/studies_base/views/study_questionnaire_views.xml b/studies_base/views/study_questionnaire_views.xml
index eeda6cb..066fcb0 100644
--- a/studies_base/views/study_questionnaire_views.xml
+++ b/studies_base/views/study_questionnaire_views.xml
@@ -49,7 +49,7 @@
                     <group name="description" string="Description">
                         <group name="description_left">
                             <field name="purpose" />
-                            <field name="subject_type" />                            
+                            <field name="subject_type" widget="many2many_tags" />                            
                         </group>
                         <group name="description_right">
                             <field name="description" />