I think this is becuase the BAPI for PO change has not been "released". If you use transaction BAPI, then click the filter button, then select "All", the PO change bapi will appear int he MM-> purchasing-> purchase order hierarchy. (BAPI_PO_CHANGE)
Although it is not officially "released", neither is the function module to do the same task. We use the BAPI on a regular basis, and it works fine. I think unreleased just means you will get no support if you use it, and SAP can change it at any time.
I am not sure what makes a BAPI go from un-released to released...
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