When creating an Expense Rate, what must you do for it to take effect?

For an Expense Rate to take effect, it is mandatory to set the Rate Checkbox in the Expense Limit/Rate Tab. This action indicates that the rate is applicable and should be utilized for expense calculations. By checking the Rate Checkbox, you are explicitly defining the expense rate that will be applied, thus making it active in the system.

While other steps, such as saving the rate settings, may also be necessary for overall process completion, the specific act of activating the rate is reliant on this checkbox being set. Therefore, without this step, the expense rate would not function correctly in the billing or approval processes.