Contingent workers

Hello All

I wanted to know how to cehck the approval workflow if a contingent worker creates a requisition

I know that Po approval workflow is related to PO's that are submitted by employee, is this the same approval workflow for contingent workers as well?

I checked in AME and could not find any thing but found work confirmation but no rules are defined

And also requesting you if you can direct me to any notes on trobleshooting of contingent workers issues

We are in R12.1.2

We use standard and complex orders

We create requisitions in iProcurement and use only expense items