Include this line hooks:
app_include_js = [“/assets/custom_app/js/lead_quick_entry.js”]
Add below code in your custom quick_entry.js
frappe.old_doc = frappe.new_doc
frappe.new_doc = function(doctype, opts, init_callback) {
if(doctype == "Lead"){
frappe.old_doc("Lead", opts, function(dialog) {
dialog.get_field("cost_center").get_query = function(doc) {
return {
filters: {
is_group: 0
}
}
}
})
}else {
frappe.old_doc(doctype, opts, function(dialog) {})
}
}