Anyone know how to disable sales and taxes charges map?

When creating sales invoice from delivery I want to disable mapping of sales taxes and charges. I just ovveride the function but I tried removing the sales taxes and charges in get_mapped_doc but still maps to the taxes table

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@frappe.whitelist()
def override_make_sales_invoice(source_name, target_doc=None, args=None):
doc = frappe.get_doc(“Delivery Note”, source_name)

to_make_invoice_qty_map = {}
returned_qty_map = get_returned_qty_map(source_name)
invoiced_qty_map = get_invoiced_qty_map(source_name)

def set_missing_values(source, target):
    target.run_method("set_missing_values")
    target.run_method("set_po_nos")

    if len(target.get("items")) == 0:
        frappe.throw(_("All these items have already been Invoiced/Returned"))

    # Skip adding taxes if custom_is_service_order is set to 1
    if frappe.utils.cint(doc.custom_is_service_order) != 1:
        if args and args.get("merge_taxes"):
            merge_taxes(source.get("taxes") or [], target)

        target.run_method("calculate_taxes_and_totals")

    # Set company address
    if source.company_address:
        target.update({"company_address": source.company_address})
    else:
        target.update(get_company_address(target.company))

    if target.company_address:
        target.update(get_fetch_values("Sales Invoice", "company_address", target.company_address))

    # Ensure grand_total equals total
    if target.total != target.grand_total:
        target.grand_total = target.total

def update_item(source_doc, target_doc, source_parent):
    target_doc.qty = to_make_invoice_qty_map[source_doc.name]

    if source_doc.serial_no and source_parent.per_billed > 0 and not source_parent.is_return:
        target_doc.serial_no = get_delivery_note_serial_no(
            source_doc.item_code, target_doc.qty, source_parent.name
        )

def get_pending_qty(item_row):
    pending_qty = item_row.qty - invoiced_qty_map.get(item_row.name, 0)

    returned_qty = 0
    if returned_qty_map.get(item_row.name, 0) > 0:
        returned_qty = frappe.utils.flt(returned_qty_map.get(item_row.name, 0))
        returned_qty_map[item_row.name] -= pending_qty

    if returned_qty:
        if returned_qty >= pending_qty:
            pending_qty = 0
            returned_qty -= pending_qty
        else:
            pending_qty -= returned_qty
            returned_qty = 0

    to_make_invoice_qty_map[item_row.name] = pending_qty

    return pending_qty

doc = get_mapped_doc(
    "Delivery Note",
    source_name,
    {
        "Delivery Note": {
            "doctype": "Sales Invoice",
            "field_map": {"is_return": "is_return"},
            "validation": {"docstatus": ["=", 1]},
        },
        "Delivery Note Item": {
            "doctype": "Sales Invoice Item",
            "field_map": {
                "name": "dn_detail",
                "parent": "delivery_note",
                "so_detail": "so_detail",
                "against_sales_order": "sales_order",
                "serial_no": "serial_no",
                "cost_center": "cost_center",
            },
            "postprocess": update_item,
            "filter": lambda d: get_pending_qty(d) <= 0
            if not doc.get("is_return")
            else get_pending_qty(d) > 0,
        },
        # Completely remove Sales Taxes and Charges if custom_is_service_order is set to 1
        "Sales Taxes and Charges": None if frappe.utils.cint(doc.custom_is_service_order) == 1 else {
            "doctype": "Sales Taxes and Charges",
            "reset_value": not (args and args.get("merge_taxes")),
            "ignore": args.get("merge_taxes") if args else 0,
        },
        "Sales Team": {
            "doctype": "Sales Team",
            "field_map": {"incentives": "incentives"},
            "add_if_empty": True,
        },
    },
    target_doc,
    set_missing_values,
)

automatically_fetch_payment_terms = frappe.utils.cint(
    frappe.db.get_single_value("Accounts Settings", "automatically_fetch_payment_terms")
)
if automatically_fetch_payment_terms:
    doc.set_payment_schedule()

return doc

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