请问dcat-admin 表单 hasMany中 select的load无效，如何解决

代码如下

$form->hasMany('input_stock_order_details', '明细', function (Form\NestedForm $form) {
    $form->select('product_id', '商品')->options(Product::where('company_id', '=', Admin::user()->company_id)->pluck("name", "id"))->load('secification_id', env('APP_URL') . '/secification/select');
    $form->select('secification_id', '规格')->options([]);
    });