SAP Portfolio and Project Management 6.1 is now released for productive use in side-by-side installations with S/4HANA Enterprise Management 1511. Customers using SAP PPM 6.1 on a standalone system can now integrate this PPM to S/4HANA Enterprise Management 1511 e.g. for integration of financial, HR related information etc..
You find all relevant information in SAP note 2289330.