Possible frappe.call issues

I’m trying to debug a couple of custom scripts I wrote for my custom app that were working in v9 but no longer are. The first is as follows:

frappe.ui.form.on("Batch Process", {
    onload: function (frm) {
        frappe.model.clear_table(cur_frm.doc, "batch_docs");
            "method": "frappe.client.get_list",
            "args": {
                "doctype": cur_frm.doc.batch_type,
                "fields": "bill_no, bill_date, name",
                "filters": {
                    "batch_id": ["=", cur_frm.doc.batch_id],
                    "status": "Draft"
            "callback": function (res) {
                if (res.message) {
                    for (i = 0; i < res.message.length; i++) {
                        var new_row = cur_frm.add_child("batch_docs");
                        new_row.invoice_number = res.message[i].bill_no;
                        new_row.document_date = res.message[i].bill_date;
                        new_row.document_name = res.message[i].name;

This is supposed to check documents of the specified doctype to see if their batch ID matches that of the current document, and if so populate a child table with various details about the document. As stated, this was working fine in v9 but now it doesn’t seem to do anything.

The second script adds a button that calls a custom function to submit all the documents in the batch:

frappe.ui.form.on("Batch Process", "refresh", function(frm) {
    cur_frm.add_custom_button(__("Submit Batch"), function() {

        frappe.call ({
            "method": "mobile_fun_customisation.controllers.batch_process.submit_documents",
            "args": {
                "doc": cur_frm.doc

This does seem to be working however it duplicates the button on screen. When I remove the frappe.call function and replace it with frappe.msgprint, there is only one button.

Any help resolving either issue would be greatly appreciated.

Resolved the issue, there were some other customisations that had been erased by the update that I needed to reimplement.