Problems passing variable in custom code

Question

Hello, in chronoforms ver 4.0 in custom code I have this php fucntion to generate a value called "Referencia":

<?php
$form->data['Referencia'] = GenReferencia($form->data['numero']);
// !! copy and paste your function code here !!
   function GenReferencia()
   {
   $mult=2;
   $pref=40;
   $fecha = getdate();
   $numero = $pref.$fecha[mday].$fecha[mon].$fecha[year].$fecha[hours].$fecha[minutes].$fecha[seconds];
   $numero = trim($numero);
   $tam = strlen($numero);
   //echo "El numero es: \t\t",$numero, "\t\tEl tamaño es: \t\t",$tam, "<br>", "<br>";
   $i=0;
  
    for($i=$tam ; $i>=1 ; $i--)
   {
      
      $dato = substr($numero, $i-1, 1);
      $resul = intval($dato) * $mult;
     
      if ($resul>9)
         { 
          $otro = trim(strval($resul));   
          $aux1=substr($otro,0,1);
          $aux2=substr($otro,1,1);
          $tot = intval($aux1) + intval($aux2);
          //echo "\t\totro :\t\t", $otro,"\t\tAux 1:\t\t", $aux1, "\t\t Aux 2\t\t", $aux2, "\t\t Total:\t\t", $tot;
          
          }
      else
         {
          $tot = $resul;
         }
 
      //echo "La posición\t\t", $i, "\t\tEl valor de dato es: \t\t", $dato, "\t\t * \t\t", $mult, "\t\t =\t\t", $resul, "\t\tValor final:\t\t", $tot, "<br>";
         $sumatot=$sumatot + $tot;
  
      $mult = $mult + 1;
   
      if ($mult>2)
         {
          $mult=1;
         }
     
   } 
// echo "La suma total es:\t\t", $sumatot;
$maximo = intval(substr(trim(strval($sumatot)),0,1)) + 1;
$maximo =$maximo * 10;
$ref = $maximo - $sumatot;
if ($maximo - $sumatot>=10) $ref=0;

//echo "<br>","La Referencia es: \t\t", $ref;
return $numero.$ref;
} 
?>

I try to do the same in version 6 but is not working, {data:Referencia} value is empty ¿any solution?

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Problems passing variable in custom code