You are not able to use CPI-DS WSDL to generate WS client stub.
Error within generation of Webservice Consumer Proxy via WSDL file
Error: Message must have exactly one part
Our WSDL currently is generated by the CXF (code first, java-to-WSDL) framework and because we have "SessionId" defined in some of the operations SOAP header, the generated WSDL for these operations contains two parts of the message.
SAP Cloud Platform Integration for Data Services
Data Services Agent Patch 18.104.22.16828
CPI-DS, CPI, multiple, parts, HCI , KBA , LOD-HCI-DS , HANA Cloud Integration for Data Services , How To
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