Anyone know how to display the accounting ledger preview in delivery note?

I override the Delivery Note class to generate the specific accounting entries for service order but when the status is draft it doesn’t display the accounting entries

import frappe
from erpnext.stock.doctype.delivery_note.delivery_note import DeliveryNote
from erpnext.accounts.general_ledger import (
make_gl_entries,
make_reverse_gl_entries,
process_gl_map,
)

class CustomDeliveryNote(DeliveryNote):
def validate(self):
super().validate()

def on_cancel(self):
    super().on_cancel()

def on_submit(self):
    self.update_stock_ledger()
    if self.custom_is_service_order:
        self.custom_make_gl_entries()
    else:
        super().on_submit()

def custom_create_gl_entries(self, gl_entries):
    """
    Creates GL Entries for COS and CWIP
    """
    if len(self.items) >= 0:
        wo_name = self.items[0].against_sales_order
        se_detail_filters = {
            "custom_sales_order": wo_name,
            "docstatus": 1
        }
        se_detail = frappe.get_all("Stock Entry Detail", filters=se_detail_filters, fields=["*"])
        ta_accomplishment = frappe.get_all("Technician Accomplishment", filters={"sales_order": wo_name}, fields=["*"])
        amount = sum(float(item.amount) for item in se_detail)
        amount += sum(float(item.labor_cost) for item in ta_accomplishment)
    
        # COS Default Company Account
        debit_account = frappe.get_value("Company", self.company, "default_expense_account")
        # Capital Work in Progress
        credit_account = frappe.get_value("Company", self.company, "capital_work_in_progress_account")
        
        gl_entries.append(
            self.get_gl_dict({
                "account": debit_account,
                "posting_date": self.posting_date,
                "against": credit_account,
                "debit": amount,
                "debit_in_account_currency": amount,
                "voucher_no": self.name,
                "voucher_type": self.doctype,
                "project": self.items[0].project,
                "cost_center": self.items[0].cost_center,
                "remarks": "TEST"
            },
                "PHP",
                item=self,
            )
        )
        
        # Create Credit Capital Work in Progress GL Entry
        gl_entries.append(
            self.get_gl_dict({
                "account": credit_account,
                "posting_date": self.posting_date,
                "against": debit_account,
                "credit": amount,
                "credit_in_account_currency": amount,
                "voucher_no": self.name,
                "voucher_type": self.doctype,
                "project": self.project,
                "cost_center": self.items[0].cost_center,
                "remarks": "TEST"
            },
                "PHP",
                item=self,
            )
        )

def custom_make_gl_entries(self, cancel=False, adv_adj=False):
    """
    Custom GL entries logic.
    """
    gl_entries = []
    self.custom_create_gl_entries(gl_entries)
    process_gl_map(gl_entries, merge_entries=False)
    make_gl_entries(gl_entries, cancel=cancel, adv_adj=adv_adj)