Hi,
The added code in the comment was not in the proper syntax, it was a mix of adding new form and inheriting an existing form.

So if you are trying to inherit and add the form, specify the record to inherit using the inherit_id key and using the xpath expression locate the node and perform the needed operation.

Thanks

You most likely have an incorrect xml. Read this post: https://www.linkedin.com/pulse/nasty-assertion-error-element-odoo-has-extra-content-malekinejad/. I also had a typo that would have never found. My IDE also didn't highlight it.

yeah when I was posting my question it was not letting me do it properly, I added a comment 

hr.expense.view.form
hr.expense

Please enter the code properly for reference. This error usually occurs when there’s extra element in the record. Like an additional attribute or extra field which don’t belong to the model.