Success Factor Employee Central integration with ECC on-premise

Hi,

I have a scenario where the functional have configured SAP Success Factors Employee Central (EC) to communicate with ECC backend for payroll data. EC is a cloud based solution while the ECC backend is on premise.

While the users try to launch some sections in EC e.g superannuation, they are redirected to a link on the ECC backend (https://servername:port/nwbc/~canvas;window=app/nwbc/~canvas;window=app/wda/hrpao_paom_masterdata?OTYPE=EMPLOYEE_CENTRAL&SINGLE_ACTION=X&WDCONFIGURATIONID=HRPAO_PAOM_MASTERDATA&NO_COLLABORATION=X&sap-client=300&sap-language=en&CFG_ID=IT0220&OBJID=2%2C322%2C9001&WDTHEMEROOT=sap_corbu)

Now this is an embedded window in EC and when I've tried to enter the username and password, it prompts the error "Logon with URL parameter not possible; logon cookie is missing".

What I'm trying to achieve here is to have an SSO between EC calling the ECC backend for data without the need of setting up an Java stack as IDP using SAML2. Is that possible?

Thanks and BR,

Philip