How to configure AP invoice approval in spreadsheet based on user mentioned in invoice header dff

Summary:

The requirement is incase of Non PO invoice, if the invoice header dff is populated with user name, the approval should route to that user and its supervisor.

How can this be achieved while configuring AP invoice approval via spreadsheet?

In Rule condition we can mention "Invoice Header.Descriptive Flexfield Attribute1".

Can you also help in guiding what to use in Start Approver given Approval Routing is "Supervisory Hierarchy" or "Job Level Hierarchy".

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