Employee should not be able to withdraw absence leave once he has submit resignation

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Hi Experts,

I  have a business requirement, I wanted to check the feasibility of this requirement, and if feasible, steps to complete the requirement. Details are mentioned below:

An employee has applied for a future leave for eg: 30 June which got approved. Then he put down his papers, i.e. he has put down his resignation which got approved,  for eg: the last working day for the employee is 30 July. 

Now the employee should not be able to withdraw his leave for 30 June, i.e. Once the employee has put down his paper he should not be able to withdraw his future approved leaves.