How to add child table field on Standard Filter in list view==> version 15

ERPNext
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1

I want to add Sales Order child table field on Standard filter (List view)

I tried this code snippet, Getting Field not permitted in query: item_code Error

frappe.listview_settings[“Sales Order”] = {
onload: function(listview) {
var df = {
fieldname: “item_code”,
label: “Item Code”,
fieldtype: “Link”,
options: “Item”,
onchange: function() {
listview.start = 0;
listview.refresh();
listview.on_filter_change();
}
};
listview.page.add_field(df);
}
};