How to restrict Knowledge base based on sold products

[Samiksha2]

Hi All,

I have a requirement to show the Knowledge bases based on sold products.

I have added the below script in user criteria

var con = new GlideRecord('customer_contact');
con.addEncodedQuery('accountISNOTEMPTY');
con.addQuery('sys_id', user_id);
con.query();
if (con.next()) {
    var acc = con.account.getDisplayValue();
    var pro = new GlideRecord('sn_install_base_sold_product');
    pro.addEncodedQuery('account=' + acc);
    pro.query();
    if (pro.next()) {
        var sold = pro.name;
        if (sold == "Adobe Systems InDesign 5.5") {
            answer = true;
        }

    }

}

And added this to Can Read related list tab.

Please let me where I am doing wrong?

Thanks,

Sam