When using the RFC interface, the SAP RFC SDK (NWRFCSDK) must be installed to run RFC calls on the SAP system. To install the required NWRFCSDK, two files are required. These can be downloaded from the SAP Software Download Center (https://launchpad.support.sap.com/#/softwarecenter). In order to download these files, a SAP Service Marketplace account with download privileges is required. Such an account should be available to Basis support of licensed SAP customers.