timing Advance notice & backdating limits submission toggle 10 Thresholds per type: Leave Types > Request Timing Limits A request must respect the leave type's Advance Notice (earliest start = today + N days) or, failing that, its Max Backdate (earliest start = today - N days); with neither set, the start date must be today or later. Skipped when HR creates a request on another employee's behalf. weekend_dates No weekend start/end dates submission toggle 15 The company is closed Saturday/Sunday, so a request whose start or end date falls on a weekend is blocked with an alert naming the date -- almost always an accidental date-picker mis-click. A multi-day request that merely spans a weekend in the middle (e.g. Friday to Monday) is unaffected. holiday_dates No leave start/end dates on a declared holiday submission toggle 17 Holidays are managed under Holidays > Holiday Calendar A declared public/company holiday is already a non-working day, so a request whose start or end date falls on one is blocked with an alert naming the date -- almost always an accidental date-picker mis-click. A multi-day request that merely spans a holiday in the middle is unaffected. HR can still create a genuine Holiday Deduction on the employee's behalf. overlap Block overlapping leave requests submission toggle 20 An employee cannot have two requests covering the same day(s) unless the earlier one is already Cancelled or Rejected. A hard block (Odoo core only shows a soft warning). activity_restricted_dates No leave on restricted activity days submission toggle 25 Tick per activity: Company Activities > Restrict Leave on These Dates A request is blocked if its dates overlap a Company Activity marked "Restrict Leave on These Dates" (e.g. a mandatory Guest Visit day). This is not an in-system emergency override -- a genuine emergency must go through HR directly, who can still create the leave on the employee's behalf (the same on-behalf paths this rule already exempts). part_time_hours Part-time hours within working schedule submission toggle 30 For a Part-time Leave, end time must be after start time, the chosen clock range must sit within the employee's scheduled working span for that weekday, and must not fall entirely inside a non-working period (e.g. the lunch break). locked_fields Lock submitted request from employee edits editing toggle 40 Once submitted, an employee can no longer edit a request's content (type/dates/reason/duration) -- only Cancel it or ask HR to update it. HR/administrators are unaffected. prorated_balance Pro-rated monthly balance balance toggle 45 Mark each type: Leave Types > Request Timing Limits > Pro-rated Monthly Accrual For leave types marked Pro-rated Monthly Accrual, a self-service request is checked against the amount accrued up to the request's month (yearly allocation / 12 x month number) minus what's already used/booked this year. Requests beyond the pro-rated entitlement are blocked, and the message suggests alternative leave types the employee still has balance in. Skipped when HR creates a request on someone else's behalf. validation_type Approval routing (who must approve) approval per_type 50 Leave Types > Approval: None / By Leave Approver / By Employee's Approver / Both Each leave type decides who must approve a request: nobody, the employee's approver (manager), a Leave Approver (HR), or both. approver_restriction Only the configured approver can decide (never self) approval core 60 Steps per department/employee: Configuration > Leave Approvers Approve/Reject act on the current step of the approval chain: a named approver must match exactly, a blank step needs a Time Off Officer, and no one can approve or reject their own leave. An integrity guarantee of the approval chain -- not switchable. allocation_balance Sufficient allocation balance & validity balance core 70 For allocation-based leave types, the employee must hold an allocation with enough remaining days whose validity window covers the requested dates. Enforced by Odoo core. contract_coverage Dates covered by employee contract submission core 80 Requested dates must fall within the employee's running contract, where contracts apply. Enforced by Odoo core. mandatory_day No leave on Mandatory Days submission core 90 Time off cannot be requested on a company Mandatory Day. Enforced by Odoo core. date_consistency Valid dates & allowed state transitions editing core 100 The date range must be valid and non-zero in duration, and edits are only allowed in states where Odoo permits them. Enforced by Odoo core.