3427809 - "unexpected" system alias is logged in gateway error log

Gateway error log shows "unexpected" system alias.

For example, in /n/IWFND/ERROR_LOG :

..SERVICE_INFO    
...NAMESPACE    /SAP/
...SERVICE_NAME    XXXXXXX
...VERSION    0001
...SYSTEM_ALIAS    XXX                            ===> this shows "unexpected" system alias                
...DESTINATION    XXXXXXX
..SYSTEM_INFO    
...REQUEST_ID    4D82ED4FCDE81EEEB096B51021C68397
...REQUEST_URI    /sap/opu/odata/sap/XXXXXXX/***Hide_due_to_secure_log_level***
...REMOTE_ADDRESS    XXXXXXX
...APPLICATION_SERVER    XXXXXXX
...HUB_VERSION_INFO    YYYYY
...BEP_VERSION_INFO    XXXXX             ====> this result "unexpected" backend system

SAP Odata gateway.

SYSTEM_ALIAS, BEP_VERSION_INFO , KBA , OPU-GW-COR , Framework , How To