Trying to override the InboundMail Class

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@Robot Please Check This Document for write custom code to override class function

Monkey Patch to add method in SalesInvoice

Monkey Patch to add method in SalesInvoice Hello, I need to add a custom method in SalesInvoice DocType. I’ve tried with no success to add a monkey patch in hooks.py of my custom app as follow: #hooks.py from erpnext.accounts.doctype.sales_invoice.sales_invoice import SalesInvoice def my_method(self): return 'Foo' SalesInvoice.my_method = my_method Any ideas? Thanks!