Unable to Cancel Duplicate Extended Absence Requests

We have employees who are submitting multiple extended absence requests for the same time period and same absence type/reason in error. We need to be able cancel the duplicate ones(s). But when we attempt to cancel a message pop up stating:

Cancel cannot apply to this Extended Absence Request. Or you did not select any Absence Request to cancel.

There is not an Absence Request to select because we are not processing the duplicate Extended Absence Request. We need to clean up all the duplicate requests. What is the best practice that others have followed to cancel and/or clean up an Extended Absence Request when it has been submitted as a duplicate?