Using position hierarchy based approvals with account coding workflow

Summary:

We are planning to use account coding workflow as currently invoice approval workflow doesn't support position based approvals. We are able to achieve position based approvals using invoice requestor entered on the invoice header, however we would like to use invoice line requester i.e deliver-to-person on PO line and position ID for this attribute is not part of the invoice account coding workflow.

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Is there anyway to trigger position based approvals using invoice line requester?

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