% if ( scalar(@{ $opt{'discount_class'} }) == 0 ) { 

  <INPUT TYPE="hidden" NAME="<% $opt{'element_name'} || $opt{'field'} || 'classnum' %>" VALUE="">

% } else { 

  <TR>
    <TD ALIGN="right"><% $opt{'label'} || 'Discount class' %></TD>
    <TD>
      <% include( '/elements/select-discount_class.html',
                    'curr_value' => $classnum,
                    %opt
                )
      %>
    </TD>
  </TR>

% } 

<%init>

my %opt = @_;
my $classnum = $opt{'curr_value'} || $opt{'value'};

$opt{'discount_class'} ||= [ qsearch( 'discount_class', { disabled=>'' } ) ];

</%init>