Before building any new ZPM, ask your developer: "Are we using a standard BAPI, or are we direct-reading from the database?" If the answer is the latter, you are building a future migration disaster.
Therefore, is not a separate software product you buy from SAP. Instead, it is the collective term for the custom layer of code and functionality layered on top of standard SAP PM. It represents the tailored "wrapper" that allows a company to manage assets in a way that fits their unique workflows, compliance needs, and reporting requirements. sap zpm
Here is the cautionary tale every CIO knows: Before building any new ZPM, ask your developer: