A balance must be recorded for all staff types to ensure their annual leave entitlement is correctly calculated. For casual and variable hours staff, their leave calculation will also be based on what leave they accrue on their hours approved.
Along with a 'Pay Code Access Group' and 'Work Schedule', a Balance must be assigned every time a new appointment is recorded, eg new starter, promotion, additional appointment, secondment, regrade, move from fixed-term to permanent contract etc.
If you have assigned a balance and want to understand the system calculation further, refer to the 'Checking assigned balances' guidance.