If you have are trying to add a late fee to your member's unpaid dues orders, this article highlights the steps to set that up.
1) Navigate to the Dues Cycle in Question
2) Open up Your Dues Schedules to make sure that a Late Fee product is assigned. The product that you have set the lookup field for Late Fee to is what the system will consider the Late Fee and will attach that product to any unpaid orders underneath that billing schedule.
3) Head back to your Dues Cycle. Click Run Workflow in the toolbar and then run the Apply Dues Late Fee workflow. You can check the status of the workflow by going to Workflows (Under Processes) on the Dues Cycle
4) To make sure that the late fee was applied, Navigate to an unpaid dues item underneath your billing Cycle and ensure that the Pricing Stage = Late Fee Applied and that the associated order has the product designated on your late fee field on the schedule