Error:Problem with SOAP Class while sending IDoc from ECC to HCI

Dear Friends,

"System Basis version is 731"

I was done integration between the systems ECC and HCI (SAP On-Premise), it is working for inbound as well as outbound IDocs,but in the Out bound IDoc I am getting status like "Problem with SOAP Class" (HCI getting proper Payload means IDoc data).

Please refer the error screen shot

Please help me to solve this issue.

HCI( HANA CLOUD INTEGRATION)

Thanks and Regards

Nani