open product.product.tree product.product Review Your Expenses Products ir.actions.act_window product.product form tree,form [('hr_expense_ok','=',True)] Define one product for each expense type allowed for an employee (travel by car, hostel, restaurant, etc). If you reimburse the employees at a fixed rate, set a cost and a unit of measure on the product. If you reimburse based on real costs, set the cost at 0.00. The user will set the real price when recording his expense sheet.