Personal calendar date in payroll status set to &

What causes this issue?

By changing this absence record, the system has set the personal
calendar date and the retroactive date back to the start of the first
absence infotype record that it links with, according to either
Statutory Sick Pay or Statutory Maternity Pay rules. The result is that
the complete Period of Incapacity for Work or Maternity Pay Period is
re-evaluated for this person in the next payroll run.

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

Error message extract from SAP system. Copyright SAP SE.