+
+sub _maybe_attach_zugferd_data {
+  my ($form) = @_;
+
+  my $record = _make_record();
+
+  return if !$record
+    || !$record->can('customer')
+    || !$record->customer
+    || !$record->can('create_pdf_a_print_options')
+    || !$record->can('create_zugferd_data')
+    || !$record->customer->create_zugferd_invoices_for_this_customer;
+
+  eval {
+    my $xmlfile = File::Temp->new;
+    $xmlfile->print($record->create_zugferd_data);
+    $xmlfile->close;
+
+    $form->{TEMPLATE_DRIVER_OPTIONS}->{pdf_a}           = $record->create_pdf_a_print_options(zugferd_xmp_data => $record->create_zugferd_xmp_data);
+    $form->{TEMPLATE_DRIVER_OPTIONS}->{pdf_attachments} = [
+      { source       => $xmlfile,
+        name         => 'ZUGFeRD-invoice.xml',
+        description  => $::locale->text('ZUGFeRD invoice'),
+        relationship => '/Alternative',
+        mime_type    => 'text/xml',
+      }
+    ];
+  };
+
+  if (my $e = SL::X::ZUGFeRDValidation->caught) {
+    $::form->error($e->message);
+  }
+}