Best approach to edit ERPNext python doctypes

[aldoblack]

You gave me a good idea but the thing is that it could not override.
So I modified a little bit by following these instructions:

How to override method in frappe?

In custom_app module_name.py import frappe from erpnext.accounts.doctype.sales_invoice.sales_invoice import SalesInvoice def shoutout(self): print("Yay!") def before_cancel(self): self.shoutout() self.update_time_sheet(None) def build_my_thing(): SalesInvoice.shoutout = shoutout SalesInvoice.before_cancel = before_cancel python console In [1]: from custom_app.module_name import build_my_thing In [2]: build_my_thing() In [3]: sales_invoice = frappe.get_doc("Sales I…

Thank you for the help.