Please do as follows to forfeit/ zerolise brought forward:
Go to the Leave module and click Modules.
Select Brought Forward Leave and set the Effective Date (enter as the first day of the new year)
Select Leave type as Annual and enter Brought forward days as 0.
Select Leave reason as None and click Save.
Note: You can also do Mass Assign by clicking on the Mass Assign tab in the Brought Forward Leave.