Fix test

src/pretix/api/serializers/order.py

@@ -117,6 +117,7 @@ class TransmissionInfoSerializer(serializers.Serializer):
         super().__init__(*args, **kwargs)
         for k, v in transmission_type.invoice_address_form_fields.items():
             self.fields[k] = form_field_to_serializer_field(v)
+            self.fields[k].required = False  # invoice_address_form_fields_required is checked by parent serializer
 
 
 class InvoiceAddressSerializer(I18nAwareModelSerializer):

src/tests/api/test_order_change.py

@@ -333,7 +333,6 @@ def test_order_update_transmission_validation(token_client, organizer, event, or
     assert resp.status_code == 400
     assert resp.data == {"invoice_address": {"transmission_info": {
         "transmission_it_sdi_pec": ["Enter a valid email address.", "Enter a valid email address."],
-        "transmission_it_sdi_recipient_code": ["This field is required."]
     }}}
 
     resp = token_client.patch(