class AdminOrderTypeExtension extends AbstractTypeExtension
{
    public function buildForm(FormBuilderInterface $builder, array $options)
    {
        $Order = $options['data'];
    }

    public function getExtendedType()
    {
        return 'order';
    }
}

class AdminShippingTypeExtension extends AbstractTypeExtension
{
    public function buildForm(FormBuilderInterface $builder, array $options)
    {
        $Shipping = $options['data'];    // ★ 取得できない
    }

    public function getExtendedType()
    {
        return 'shipping';
    }
}