How to restrict Employee to withdraw an approved Leave by Manager

Summary:

Dear Team,

The Client requirement is, an employee can apply for an Annual leave.

The Line Manager needs to approve that Leave.

The Employee should be able to withdraw his applied Annual leave before Approval by Line Manager.

But once the LM approves the Leave, the employee should be restricted to withdraw the approved Annual leaves.

Now, the issue is, after leave approval also, the employee is able to withdraw his approved Annual leave.

We tried one solution but it is not working.

Navigation-> Absence Plans -> Annual Leave and PFA Screenshot.

But still Employee can able to withdraw the Approved leave.