Answer
Average weekly earnings and ordinary weekly pay are used when valuing annual holidays. Lightning Payroll uses payroll pays plus imported historic gross earnings to build the earnings history needed for those checks.
Open Employees >> Leave >> Historic Pay to see the coverage used for the calculation. The screen shows AWE per week, OWP per week, weeks with earnings data, coverage percentage, and the date range being reviewed.
The imported historic earnings table marks rows as superseded by a Lightning Payroll pay, counted toward AWE, or outside the 12-month window. If coverage is incomplete, import or correct historic gross earnings before relying on leave valuations.