The only warnings seen in the Error & Warnings Report that are able to be configured are those for Gross Earnings as well as Ordinary and Overtime Hours.

The values for these thresholds can be adjusted at any of the four main scope levels.

Navigate to the Company Tab > Components Setup and search for the Tax Details component. The values for the below warning thresholds can be adjusted here:

Warning Threshold for Gross Pay
Warning Threshold for Gross Pay Percentage
Warning Threshold for Ordinary Hours
Warning Threshold for Overtime Hours

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