Fix invoice group creation

aleksis/apps/tezor/views.py

@@ -188,11 +188,9 @@ class InvoiceGroupCreateView(PermissionRequiredMixin, AdvancedCreateView):
 
     def form_valid(self, form):
         client = Client.objects.get(id=self.kwargs["pk"])
-        InvoiceGroup.objects.create(
-            client=client,
-            name=form.cleaned_data["name"],
-            template_name=form.cleaned_data["template_name"],
-        )
+        self.object = form.save()
+        self.object.client = client
+        self.object.save()
 
         return super().form_valid(form)