Hi Yves,
Did you check the info in SM59 (RFC connection) and have successfully tested the connection?
It seems to me the the RFC-connection is somehow not updated between SAP-CPS as the RFC Agent status is not "sync" between them.
Also check from your CPS-side as well (e.g. Process Servers parameters SAP_EnableRfcServer;
SAP_API_DefaultScheduler, and restart PS?)
I hope this will help you.
Regards,
Andre