Self-service order change: Enforce hidden variations

src/pretix/presale/forms/order.py

@@ -72,12 +72,17 @@ class OrderPositionChangeForm(forms.Form):
             quota_cache.update(qa.results)
 
             for v in variations:
-
                 label = f'{i.name} – {v.value}'
                 if instance.variation_id == v.id:
                     choices.append((f'{i.pk}-{v.pk}', label))
                     continue
 
+                if instance.voucher and not instance.voucher.applies_to(i, v):
+                    continue
+
+                if v.hide_without_voucher and not (instance.voucher and instance.voucher.show_hidden_items):
+                    continue
+
                 if not v.active:
                     continue