Reassign invoice approval notifications for employees that have taken unplanned leave

Summary:

When employees need to take unexpected, unplanned leave, they sometimes forget to delegate their approval notifications. In order to continue the invoice approval process, there is a need for a super user to:
- reassign open approval notifications to another employee, on behalf of the person who has taken unplanned leave
- create vacation rules for the person who has taken unplanned leave.
Can you advise what is the super user access required to perform these tasks for payables approvals?

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