AP Invoices Approval Rule creation based on the Previous Approver history

Summary:

Problem Summary
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AP Invoices Approval Rule creation based on the Previous Approver history

Problem Description
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We have a need for the supplier portal invoice approval process for Non PO invoices. Once the Non PO Invoice submitted, the requester gets the notification for action. We have to create an approval rule based on the last approver of the invoice which in this case is the requestrer. We can do this as per the requester task attribute from BPM worklist.

We have an issue - If the requester reassign the invoice to someone else and we need to create the approval rules as per the reassigned approver. This is not working. The approval rules should be working as per the last approver, it can be requester or the reassigned user by requester.