This error means that absence has already been paid in SelectPay.
To amend the absence end date you will need to make this record a fully paid absence by ensuring the absence end date matches the paid up to date and then create a new record for any remaining absence after that date. The system will see this as one continuous absence.
To resolve this issue, follow these steps.
Navigate to the Absence History details of the individual involved.
Drill into the details of the absence.
Check to see if there is a Paid Up To date populated.
If a date has been entered, ensure that the absence end date matches this date.
A new record for any remaining absence after that date will then need to be entered.