When you enable the Supplementary Run toggle and encounter the above warning message, this indicates that the supplementary run is unavailable because pay history has already been created for the next period.
This warning is a new feature designed to help you proceed with a supplementary payroll while preventing issues that arise from prior pay history. To avoid seeing this message, ensure that you run the supplementary payroll before creating any manual payments in the current payroll period and before completing the Payroll Update job for the current payroll period.
📌Note: Once the pay history is created for the next period, you'll be unable to remove this warning and cannot enable the supplementary payroll run.