Solution : https://service.sap.com/sap/support/notes/804139 (SAP Service marketplace login required)
Key words :
terms jrfc jco rfc cpic 'j2ee engine 6, rfc communicationbetween sap j2ee engine, 6d patch level 1950the problem, sap abap backend abap kernel 6, sap j2ee engine side, unicode enabled abap kernels, 40 patch level 0 abap kernel 6, 20 patch level 1476 abap kernel 4, sap j2ee engine 6, rfc call failed
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