Answer
Historic gross earnings are needed when Lightning Payroll does not yet have enough completed pays to calculate leave valuations from payroll history.
The Employees >> Leave >> Historic Pay tab shows the earnings coverage used for annual holiday valuation. It lists imported historic gross earnings, Lightning Payroll pays from the last 12 months, AWE per week, OWP per week, covered weeks, coverage percentage, and the date range being reviewed.
Rows may be marked as superseded by a Lightning Payroll pay, counted toward AWE, or outside the 12-month window. If coverage is incomplete, import or correct the missing gross earnings before relying on annual holidays, final pay, or cash-up valuations.