SAP RFC SDK (NWRFCSDK) is required to run the RFC calls on the SAP system.
To install SAP RFC SDK:
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Sign into the SAP Software Download Center with a SAP Service Marketplace account that has download privileges.
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Search for NWRFC.
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Download the 64bit version of the SAP NetWeaver RFC SDK that matches your operating system. A zip file downloads to your computer.
j5 supports NetWeaver RFC SDK 7.50 PL3 and later.
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Extract the files from the downloaded zip file.
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Move the nwrfcsdk folder to a general location such as C:/. Don't save the folder in a user specific area (such as the Desktop) as this sometimes has permission issues.
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During setup, select Browse, go to the nwrfcsdk\lib folder, and select Open.