# credit notes have a negative amount, treat differently
   my $all_open_ar_invoices = SL::DB::Manager::Invoice        ->get_all(where => [ or => [ amount => { gt => \'paid' },
                                                                                           and => [ type    => 'credit_note',
   # credit notes have a negative amount, treat differently
   my $all_open_ar_invoices = SL::DB::Manager::Invoice        ->get_all(where => [ or => [ amount => { gt => \'paid' },
                                                                                           and => [ type    => 'credit_note',