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class Leads_model extends Base_module_model {
     ...
     function form_fields($values = array(), $related = array()){	
          $fields = parent::form_fields($values, $related);
          $fields['cost'] = array('type' => 'number', 'negative' => TRUE, 'decimal' => TRUE);
          return $fields;
     }class Orders extends Fuel_base_controller {
     ...
     $leads = $this->leads_model->find_all(array('order_id' => $id));
     echo $leads[0]->cost;
     die();Produces: 30
Comments
https://github.com/daylightstudio/FUEL-CMS/commit/353746e4d8e5ae2c75905bd2cc62ba7574fede13
That fixed the problem.
Much thanks.