The leave year holds all the information for the entitlement and uses the annual increments, adjustments, carry over, service days and so on to calculate it. Firstly it is important that this information is in place before the leave year is calculated so that it is complete, and secondly once the leave year is create for that year no other automatic adjustments are made to it. Manual adjustments are still possible though.
In order to ensure the leave year always has the most up to date information in it, it is only created once it is needed for the first time. So when an employee first logs in they will see that their leave year has not been created. They can create it either by clicking create at the top of the dashboard or simply by requesting leave.
Leave years can be created in bulk (where they haven't been created already) by going to Admin > System Functionality (dropdown menu) > Leave > Leave Cycles > Bulk Process Adjustments (This Year). IT IS RECOMMENDED TO LET THE SOFTWARE CREATE THE LEAVE YEAR WHEN IT WANTS AND NOT TO BULK ADD THEM.