diff --git a/app/models/concerns/dossier_state_concern.rb b/app/models/concerns/dossier_state_concern.rb
index e90902066..fae8b5f91 100644
--- a/app/models/concerns/dossier_state_concern.rb
+++ b/app/models/concerns/dossier_state_concern.rb
@@ -62,7 +62,6 @@ module DossierStateConcern
     MailTemplatePresenterService.create_commentaire_for_state(self, Dossier.states.fetch(:en_instruction))
 
     if procedure.sva_svr_enabled?
-      # TODO: handle serialization errors when SIRET demandeur was not completed
       log_automatic_dossier_operation(:passer_en_instruction, self)
     else
       log_automatic_dossier_operation(:passer_en_instruction)
diff --git a/app/services/serializer_service.rb b/app/services/serializer_service.rb
index 6f97841c1..04ee431ea 100644
--- a/app/services/serializer_service.rb
+++ b/app/services/serializer_service.rb
@@ -164,6 +164,7 @@ class SerializerService
       demandeur {
         ...PersonnePhysiqueFragment
         ...PersonneMoraleFragment
+        ...PersonneMoraleIncompleteFragment
       }
       motivation
       motivationAttachment {
@@ -309,6 +310,10 @@ class SerializerService
       }
     }
 
+    fragment PersonneMoraleIncompleteFragment on PersonneMoraleIncomplete {
+      siret
+    }
+
     fragment AddressFragment on Address {
       label
       type