Allow to require invoice name only

src/pretix/base/forms/questions.py

@@ -242,3 +242,12 @@ class BaseInvoiceAddressForm(forms.ModelForm):
                                                      'resolve this manually.'))
         else:
             self.instance.vat_id_validated = False
+
+
+class BaseInvoiceNameForm(BaseInvoiceAddressForm):
+
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+        for f in list(self.fields.keys()):
+            if f != 'name':
+                del self.fields[f]

src/pretix/base/views/mixins.py

@@ -7,7 +7,7 @@ from django.db.models import Prefetch
 from django.utils.functional import cached_property
 
 from pretix.base.forms.questions import (
-    BaseInvoiceAddressForm, BaseQuestionsForm,
+    BaseInvoiceAddressForm, BaseInvoiceNameForm, BaseQuestionsForm,
 )
 from pretix.base.models import (
     CartPosition, InvoiceAddress, OrderPosition, Question, QuestionAnswer,
@@ -144,6 +144,7 @@ class BaseQuestionsViewMixin:
 
 class OrderQuestionsViewMixin(BaseQuestionsViewMixin):
     invoice_form_class = BaseInvoiceAddressForm
+    invoice_name_form_class = BaseInvoiceNameForm
     only_user_visible = True
 
     @cached_property
@@ -184,6 +185,12 @@ class OrderQuestionsViewMixin(BaseQuestionsViewMixin):
 
     @cached_property
     def invoice_form(self):
+        if not self.request.event.settings.invoice_address_asked and self.request.event.settings.invoice_name_required:
+            return self.invoice_name_form_class(
+                data=self.request.POST if self.request.method == "POST" else None,
+                event=self.request.event,
+                instance=self.invoice_address, validate_vat_id=False
+            )
         return self.invoice_form_class(
             data=self.request.POST if self.request.method == "POST" else None,
             event=self.request.event,