private function validateItems($items)
    {
        $rules = [];
        for ($cont = 1; $cont <= $this->itemsCount; $cont++) {
            $rules = array_merge($rules, [
              'itemId'.$cont          => 'required|max:100',
              'itemDescription'.$cont => 'required|max:100',
              'itemAmount'.$cont      => 'required|numeric|between:0.00,9999999.00',
              'itemQuantity'.$cont    => 'required|integer|between:1,999',
            ]);
        }

        $this->validate($items, $rules);
    }