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

Employees can pay for expenses using company Credit Cards.

In this case, there is the need for the Expense to identify
what Credit Card was used for that payment.

This allows the Expense report to use the correct journal,
and have the payment accounting enty to be posted in the correct place.