Absence Approval Rule for Duration Changes

Summary:

Approval Rule Configuration for Absence

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Hi,

We have a request where if a manager or employee makes a change to the duration of an already approved absence in the past, it should route to HR for approval.

i.e. On July 10, manager edits his employee's absence from April 10 - April 15 to June 26 - 27. Since there is a change in duration and is in the past, it should route to HR for approval.

Does anyone know how this can be configured in Approval Rule? We could not find any Current vs Proposed in the approval rule selection for Absence.