oca-technical/odoo-bringout-oca-hr-expense-hr_expense_invoice/hr_expense_invoice/readme/DESCRIPTION.rst

This module should be used when a supplier invoice is paid by an employee. It
allows to set a supplier invoice for each expense line, adding the
corresponding journal items to transfer the debt to the employee.

There are 2 ways to reference expense to invoice.

1. On expense, directly select one invoice.
2. On expense report, use button "Create Vendor Bill" to create one invoice
   for multiple expenses.