diff --git a/src/authentic2_cut/apps.py b/src/authentic2_cut/apps.py
index 3f3791f..97e7951 100644
--- a/src/authentic2_cut/apps.py
+++ b/src/authentic2_cut/apps.py
@@ -285,7 +285,7 @@ class AppConfig(django.apps.AppConfig):
                 choices=[
                     ('online', 'online'),
                     ('office', 'office'),
-                ])
+                ], required=False)
             serializer.fields['validation_partner'].read_only = True
             serializer.fields['creation_mode'].read_only = True
             serializer.fields['creation_partner'].read_only = True