function create_charge_sociale($id_source, $date)
 {
     global $user;
     // Récupération de la charge sociale initiale
     $obj = new ChargeSociales($this->db);
     $obj->fetch($id_source);
     if (empty($obj->id)) {
         return false;
     } else {
         // Création de la nouvelle charge sociale
         $chargesociale = new ChargeSociales($this->db);
         $chargesociale->type = $obj->type;
         $chargesociale->lib = $obj->lib;
         $chargesociale->date_ech = $date;
         $chargesociale->periode = $date;
         $chargesociale->amount = $obj->amount;
         $id = $chargesociale->create($user);
         $chargesociale->add_object_linked('chargesociales', $id_source);
         return $id;
     }
 }