Not able to change the employment start date of an employee

Issue:
There is an employee for that client who wants to update the hire date of an employee and they are getting below error.
Error Message: 
You can't select this date as assignment having number E4663 is used in manager relationship. Remove the relationship or select a date that's before 18-Apr-2022.
 
Solutions
The person (4663) either has direct reports as of 18th Apr, or has had a history of employees reporting to him in the past for this specific Work Relationship.
If there are employees who have had a Supervisor record with this Person Number as manager, in the past. These supervisor rows should also be corrected (reassigned to a valid supervisor) before attempting to change the hire date for person 4663.

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