How to avoid absence approval notification from going twice?

Summary:

How to avoid absence approval notification from going twice?

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Absence approval rule configured as to go to the line manager then Human resource specialist, we have some of the employees have AOR as a human resource specialist on a specific business unit. when they submit their absence from "ME" it goes to their line manager then return to them again as they have Human resource specialist AOR . so I need to prevent if the employee have AOR as Human resource specialist doesn't get approval notification after his line manager at the same times if anyone from the employees who doesn't have this AOR when they apply for a