$form->error($locale->text('Cannot storno invoice for a closed period!'));
}
+ # save the history of invoice being stornoed
+ $form->{snumbers} = qq|invnumber_| . $form->{invnumber};
+ $form->{addition} = "STORNO";
+ $form->save_history;
+
map({ my $key = $_; delete($form->{$key}) unless (grep({ $key eq $_ } qw(id login password type))); } keys(%{ $form }));
invoice_links();