diff --git a/src/authentic2_cut/apps.py b/src/authentic2_cut/apps.py
index 7d202d4..3f3791f 100644
--- a/src/authentic2_cut/apps.py
+++ b/src/authentic2_cut/apps.py
@@ -286,6 +286,7 @@ class AppConfig(django.apps.AppConfig):
                     ('online', 'online'),
                     ('office', 'office'),
                 ])
+            serializer.fields['validation_partner'].read_only = True
             serializer.fields['creation_mode'].read_only = True
             serializer.fields['creation_partner'].read_only = True
             serializer.fields['creation_domain'].read_only = True