Adding and removing the 'Do not re-employ' flag
When terminating an employee, ticking the 'Do Not Rehire' box will prevent them from having any other employments added in the future, meaning you will not be able to add an employment for them even with System Owner rights.
However, if this has been ticked by mistake, you can remove the 'Do not re-employ' flag by following the steps below:
Search for the employee and go to their profile.
Click the Admin tab, then click Admin in the menu on the right.
Click Remove Do Not Re-employ Flag.
Click Yes.
Permission needed
In order to remove the Do not re-employ flag you will need the permission called 'HR Admin - Do Not Re-Employ Flag' which can be added for you by your manager or any System Owner user following the steps in our article on adding permissions.