How to I prevent someone from flying under a certain account balance?

This article is to show you how to prevent students/renters from flying with a negative or certain/specified account balance.  This feature is set by Activity Type.  Navigate to Settings > General > Scheduling > Activity Type. Then select the activity type you want to change > Schedule & Dispatch Requirements > Edit.  Click the "Add Requirements" button under the Role you'd like the add this requirement to.

Scroll to the bottom of the list and check the box next to "Customer Balance Not Below ____".

Select "Schedule Requirement/Dispatch Requirement" from the drop down menu and enter in the balance you do not want your renter/customer to drop below.  Hit "Save Button and repeat this process for any activity type you want this to apply to.