SSL handshake with eu2.hana.ondemand.com:443 failed: SSSLERR_PEER_CERT_UNT

Dears,

We are getting below error from SOAMANAGER while trying to ping SF webservice. I have uploaded exported SSL Certificates from S4 and added in CPI key store and imported all SAP Global root ca, ca g2, global g2 and cloud integration ceritifcate in S4 system, still we are getting the below error..?

SSL handshake with eu2.hana.ondemand.com:443 failed: SSSLERR_PEER_CERT_UNT Error Error when processing Web service call,

Thanks..