If a Recurring Schedule should end at a fixed date then this can be entered by defining an expiration date.
While Adding a New Schedule or Modifying an Existing Schedule, scroll down to the Recurring Schedule section and select Define Expiration.
The screen expands to show the Expiration entry section.
Enter the expiration date by clicking in the date box and selecting the date from the date picker.
Select 
to save the schedule.
The recurring schedule will now end on the last recurrence before the expiration date.