Sorting fields in shipping forms

Hi guys,
I would like to use woocommerce filtr priority in shipping form in checkout page. Because I am not programmer and I am looking for some solutions. I found and used this code in functions.php in theme-child:

add_filter(‘woocommerce_default_address_fields’, function($address_fields) {
$address_fields[‘billing_iscomp_field’][‘priority’] = 1;
$address_fields[‘billing_company’][‘priority’] = 2;
$address_fields[‘billing_ic’][‘priority’] = 3;
$address_fields[‘billing_dic’][‘priority’] = 4;
return $address_fields;
});

but this doesnt work. Do you know, where is mistake?
Thank you.

Maverick10

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