my $attachment_filename = $main::locale->unquote_special_chars('HTML', $self->get_formname_translation());
my $prefix = $self->get_number_prefix_for_type();
if ($self->{preview} && (first { $self->{type} eq $_ } qw(invoice credit_note))) {
my $attachment_filename = $main::locale->unquote_special_chars('HTML', $self->get_formname_translation());
my $prefix = $self->get_number_prefix_for_type();
if ($self->{preview} && (first { $self->{type} eq $_ } qw(invoice credit_note))) {