Absences from work, wether they are planned or not, are described in Lucca using three concepts : LeaveRequests, LeavePeriods and Leaves.A LeaveRequest represent the request made by employees when planning time off. This resource is used for workflow purposes.A LeavePeriod is the continuous period of absence requested by the employee or entered by HR. It is linked to a LeaveRequest if workflow applies.A Leave is the subdivision of a LeavePeriod. There is one Leave per half-day of the LeavePeriod. Each Leave is linked to a LeaveAccount, which represent the type of leave (PTO, Sick Leave, Congés payés, RTT, etc).LeaveRequests status are by default in the pending_approval state. LeaveRequests status can be approved, denied, cancelled or in the cancellation_pending state.