How to stop email notifications for Invoices that are already approved and workflow completed?

Summary:

We have a couple invoices that have been approved and paid that managers keep getting reminder emails and notifications to approve. It looks like it gets caught when AP withdraws the approval, makes a change to a different approver, and resubmits for approval. Oracle sends it for approval but continues to remind the original approver to approve in addition even though it is Workflow completed by the updated approver. We also have an instance for an invoice that was cancelled in the system and the manager is getting reminder emails. Synchronize Notifications in Global Header is scheduled to run every 15