How can I clear a draft of a canceled document from the Approval process

Hello Gurus, 

My lawsuit has an support signifier acceptable up, and needs to alteration the database of Authorizers owed to institution turnover. 

When removing that idiosyncratic from the database of Authorizers and adding the intended replacement, we person the pursuing reddish set error: 

Cannot update support stage; existing authorization processes are based connected existent stage

So, navigating to Administration -> Approval Process -> Approval Status Report, and entering the pursuing Selection Criteria: 

With Template From: and Template To: specifying the Approval Stage that needs to beryllium altered.

In the results, I spot Purchase Order Document Draft 51526 listed. The Document draught is listed arsenic Status: Approved, and erstwhile opened, supra the header the papers reads "Purchase Order -  Draft for Document Update [Approved].

When opening Purchase Order 51526, that papers is canceled.

Reviewing the Change Log, I spot that successful History Instance 2, supra the papers header the papers reads "Purchase Order - Document Update [Pending]", and by History Instance 3, the papers was canceled. 

Now, to my question: How tin I wide this Approved draught of a Canceled papers truthful that the Approval Stage tin beryllium modified? 

Thank you for your assistance.