Sales Taxes and Charges Template Not Working

I am working on ERPNExt V14 and I had t create a duplicate from Quotation Doctype. The rate and amount weren’t working, I had to use client script(Someone here helped me with that) to get the amount to be calculated and also, the total and grand total. I observed Sales Taxes and Charges Template isn’t pulling the pre-saved value and applying it as it does in original Doctypes. How do I get this to work?

Here is the client script in use:

frappe.ui.form.on("Prop Item", {
  item_code: function (frm, cdt, cdn) {
    var child = locals[cdt][cdn];
    if (child.item_code) {
      calculateTotal(frm);
    }
  },

  qty: function (frm, cdt, cdn) {
    var d = locals[cdt][cdn];
    frappe.model.set_value(cdt, cdn, "amount", d.qty * d.rate);
    calculateTotal(frm);
  },

  rate: function (frm, cdt, cdn) {
    var d = locals[cdt][cdn];
    frappe.model.set_value(cdt, cdn, "amount", d.qty * d.rate);
    calculateTotal(frm);
  },
});


function calculateTotal(frm) {
  var total = 0;
  frm.doc.items.forEach(function (item) {
    total += item.amount;
  });
  frm.set_value("total", total);
}



frappe.ui.form.on("Prop Item", {
  item_code: function (frm, cdt, cdn) {
    var child = locals[cdt][cdn];
    if (child.item_code) {
      calculateGrandTotal(frm);
    }
  },

  qty: function (frm, cdt, cdn) {
    var d = locals[cdt][cdn];
    frappe.model.set_value(cdt, cdn, "amount", d.qty * d.rate);
    calculateGrandTotal(frm);
  },

  rate: function (frm, cdt, cdn) {
    var d = locals[cdt][cdn];
    frappe.model.set_value(cdt, cdn, "amount", d.qty * d.rate);
    calculateGrandTotal(frm);
  },
});


function calculateGrandTotal(frm) {
  var grand_total = 0;
  frm.doc.items.forEach(function (item) {
    grand_total += item.amount;
  });
  frm.set_value("grand_total", grand_total);
}

Thank you

Can anyone help me with this?

Can anyone help me with this?