my $attachment_filename = $formname_translations{$form->{"formname"}};
my $prefix;
- if ($form->{"type"} =~ /invoice/) {
+ if (grep({ $form->{"type"} eq $_ } qw(invoice credit_note))) {
$prefix = "inv";
} elsif ($form->{"type"} =~ /_quotation$/) {
$prefix = "quo";