public function execute()
 {
     $sku_id = waRequest::post('sku_id', 0, waRequest::TYPE_INT);
     $product_id = waRequest::post('product_id', 0, waRequest::TYPE_INT);
     $after_id = waRequest::post('after_id', 0, waRequest::TYPE_INT);
     if (!$sku_id) {
         $this->setError(_w("Error when delete: unknown sku"));
     } elseif (!$product_id) {
         $this->setError(_w("Error when delete: unknown product"));
     } else {
         try {
             $product_skus_model = new shopProductSkusModel();
             $product_skus_model->move($sku_id, $after_id, $product_id);
         } catch (waException $e) {
             $this->setError($e->getMessage());
         }
     }
 }