2942640 - DB6: "No valid source context supplied" error during parameter check

Parameter check in dbacockpit fails with error:

Providing SAP master note for the paramater check tool ...
No valid source context supplied
Error when reading SAP Note 0001334923: Return code = 0.

No corresponding information is documented in SAP system log (T-cd: SM21).

Nevertheless, following error is updated in the work process trace under the work directory (T-cd: ST11).
(The corresponding trace can be found with the timestamp updated while issue is reproduced)

 SXPG: CL_DB6_TREE_NAVIGATOR=========CP CL_DB6_TREE_NAVIGATOR=========CM003 METHOD CALL_ACTION

 L SXPG: SAPLSDBACCMS RSDB6NAV MODULE (PBO) PREPARE_OUTPUT_0900
 L SXPG: End of ABAP Callstack
 L SXPG: ----------------------------------
 L SXPG_COMMAND_CHECK: user XXXXXX no authority for command SAPCAR
 L SXPG_COMMAND_EXECUTE(LONG):
 L <timestamp>: 20200618181819
 L COMMANDNAME: SAPCAR
 L ADDITIONAL_PARAMETERS: -tvVf /usr/sap/trans/tmp/0001334923_00.SAR
 L LONG_PARAMS:
 L OPERATINGSYSTEM: UNIX
 L TARGETSYSTEM: ucaprdsrmap02
 L DESTINATION:
 L SY-SUBRC: 501
 L SXPG: ----------------------------------
 L SXPG: Begin of ABAP Callstack
 L SXPG: rc = Error 503
 L SXPG: SAPLSSXP LSSXPF01 FORM WRITE_CALLSTACK
 L SXPG: SAPLSSXP LSSXPF01 FORM SYSLOG_COM_EXEC
 L SXPG: SAPLSSXP LSSXPU08 FUNCTION SXPG_COMMAND_CHECK
 L SXPG: SAPLSSXP LSSXPU03 FUNCTION SXPG_STEP_COMMAND_START

SAP on IBM Db2 for Linux, UNIX, and Windows

Parameter check, dbacockpit, No valid source context supplied , KBA , BC-DB-DB6-CCM , CCMS/Database Monitors , BC-DB-DB6-DBA , Database Administration , Problem