Client script event order

I have custom script defined for sales_order.js, I want to do some logic on item_code change:

frappe.ui.form.on('Sales Order', {
    setup: function(frm) {
    refresh: function(frm) {

frappe.ui.form.on("Sales Order Item", {
    item_code: function(frm,cdt,cdn) {
        var item_row = locals[cdt][cdn];

It seems my custom item_code handler is run before the erpnext item_code handler defined in erpnext/public/js/controllers/transaction.js

Is there any way to run my custom handler last, after all erpnext handlers have executed ?