The functionality aims to limit the maximum amount of a specified form of work performed and to set their minimum amount within defined time frames. Restrictions should be defined in the configuration and assigned in the employment document of the employees to whom they apply.

If the form of work performed exceeds the defined limit in given periods or is insufficient, an alert will be displayed for each period. Both in the schedule view and in the calendar, the alert can be seen by clicking the alert icon (an exclamation mark in a triangle).
If an employee has a settlement period longer than one month, the alert will appear in the last month of the period.

You can find more information on this topic in the article: Restrictions on Forms of Work Performed