2698371 - SUM Error DBSL error 99: couldn't execute parellel re-validation by concurrent update during Upgrade phase MAIN_SWITCH/EU_SWITCH

While running an upgrade using Software Update Manager (SUM) tool, Upgrade might halt with below error:

Log File:

..SUM/abap/log/RENAME_TNEW_T<XX>.LOG

1 ETQ399 Executing SQL script '../var/RENAME_TNEW_T02.TQL'.
2 ETQ399 Connecting to database 'HDB'.
4 ETQ010 Date & Time: 20180901222654
3 ETQ398 SQL: RENAME TABLE "T001L~" TO "T001L"
4 ETQ010 Date & Time: 20180901222655
1EETQ008 Error message: DBSL error 99 (db code 129):
1EETQ008 transaction rolled back by an internal error:
1EETQ009Xindex delete
1EETQ009Xerror:couldn't execute parellel re-validation by concurrent update.
1 ETP111 exit code : "20"

In HANA indexserver_alert traces:

[60338]{253567}[59/76173248] 2018-04-27 13:38:47.781810 e cs_ddl RemoteRequestExecutor.cpp(00067) : csddl/DropView: handle for PDH::_SYS_BIC:_SYS_SS_CE_1957670_TMP (v 2091403) failed: 
couldn't execute parellel re-validation by concurrent update.(129)[60338]{253567}[59/76173248] 2018-04-27 13:38:47.781986 e SQLScript metadata.cc(00238) : 
Failed to drop calculation view _SYS_BIC._SYS_SS_CE_1957670_TMP : transaction rolled back by an internal error

• SAP Netweaver based systems
• HANA Database

RENAME_TNEW, RENAME_TNEW_T, EU_SWITCH, DBSL error 99, HANA bug, HDB bug, CALL SYS.SQLSCRIPT_CLEAR_LEGACY_CALCSCENARIOS_DEV(), SQLScript , KBA , BC-UPG-TLS-TLA , Upgrade tools for ABAP , HAN-DB , SAP HANA Database , Bug Filed