2830392 - Error in phase MAIN_POSTCLEAN/SQLDB_DDXTT_TRUNC_CONV_UC for table DDXTT_CONV_UC

While performing a SPS update on SAP BW/4HANA 2.0 or upgrading from SAP BW/4HANA 1.0 to SAP BW/4HANA 2.0, SUM is stuck in phase MAIN_POSTCLEAN/SQLDB_DDXTT_TRUNC_CONV_UC and you find the following entries in the below logs:

SAPupConsole.log:
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Severe error(s) occurred in phase MAIN_POSTCLEAN/SQLDB_DDXTT_TRUNC_CONV_UC!
Last error code set:
Process <path to SUM>\abap\bin/SAPuptool exited with 20, see
'<path to SUM>\SUM\abap\log\SQLSTMTSTD.OUT' for details

and

SQLSTMTSTD.OUT:
----------------------------------------------------------------------------------

EXECUTING <path to SUM>\abap\bin\SAPuptool.EXE execdb ..\var\SQLDBSCRIPT.SQL
Logging to '<path to SUM>\abap\log\SQLDBSCRIPT.OUT'
1EETQ008 Error message: DBSL error 103 (db code 259):
1EETQ009Xinvalid table name: DDXTT_CONV_UC: line 1 col 16 (at pos 15)
1EETQ003 exit code: "20"

You may get also "1EETQ009Xinvalid table name: DDXTF_CONV_UC"  error.

• Upgrading from SAP BW/4HANA 1.0 to SAP BW/HANA 2.0
• Updating SPS on SAP BW/4HANA 2.0
• Using SUM tool

KBA , BC-UPG-TLS-TLA , Upgrade tools for ABAP , Problem