AP Invoice approval re-initiation on requestor termination

Hi Team,

We are trying to find out solution on below scenario. Would you please provide your feedback ?

1. PO got created and approved. PO Requestor is Mr. ABC

2. Invoice is created and matched to PO and sent for approval to Mr. ABC

3. Mr ABC is terminated.

4. PO is updated with new requestor.

Now in this scenario, AP team has to follow below for each invoice manually,

1. Stop the invoice approval.

2. Discard the line.

3. Initiate approval again.

Is there any way AP team can automate the mentioned process by use of any standing program or what would be the best practice we can implement ?