Solution : https://service.sap.com/sap/support/notes/787328 (SAP Service marketplace login required)
Key words :
/400 os/400 operating system unknown exception uname_output_unknown cpu utilization load average reason, operating system os400 unknown, r3<sid>data/opsystem values, exception condition as4_only_function occurs, sy-opsys system field, component bc-op-as4, sy-opsys field, platform-specific code, short-term solution, short-term basis
Related Notes :
664679 | Installing 6.40 kernel in SAP WEB AS 6.10/6.20 |