I've used Odoo Enterprise, V16.

I use the Expense app to record expenses to re-invoice customers. Most of my expense products are outsourcing services that will be re-invoice to customers. However, I have trouble using the expense app in my company. 

1. For the expense products with 0 cost, the field "Quantity" will not be showing.
2. For the expense product with cost (when cost field in product is not 0), the payment radio option (Employee or Company) will be invisible. I can't choose the option "Company". 

In my case of using expense app, I pay for services from others and re-invoice to customers. These expenses are always paid by the company but the costs are not fixed. 

Would you please suggest to me what I should do?

Thank you