2775442 - Netweaver upgrade reports -650 reason 21 in execution phase

While upgrading Netweaver you see the following -650/SQL0650N sql error reported with reason code 21 during ALTER table operation:

4 EPU202X====MARK ANALYZED SECTION==== END OF TP MVNTABS OPERATION ddln BEGIN OF PARMVNT_XCNV 
# /usr/sap/upgrade/SUM/abap/log/PD000329_PARMVNT_XCNV.DP3:

3 ETP379X02:42:00: activating Nametab "ADMI_RUN":
2 ETP000 >> Name of inactive nametab to read : DDXTT
2 ETP000 >> Format of inactive nametab to read: B
3 ETP355Xstatements:
3 ETP000 ALTER "DOCUMENT" SET DEFAULT ' '
3 ETP000 ALTER "OLD_DOCUMN" SET DEFAULT ' '
3 ETP000 ALTER "ORIG_DOCUMENT" SET DEFAULT ' '
3 ETP000
2WETP000 02:42:00: Retcode 1: error in DDL statement for "ADMI_RUN " - repeat
2EETP345 02:42:12: Retcode 1: SQL-error "-650-[IBM][CLI Driver][DB2] THE ALTER STATEMENT CANNOT BE
2EETP345 EXECUTED, REASON 21" in DDL statement for "ADMI_RUN "
2 ETP000 --------------- DB-ROLLBACK() ---------------
2EETP334 02:42:12: error in DDL, nametab for "ADMI_RUN" not activated
2 ETP301 ----------------------------------------------------------------------
3 ETP361 "0" Shadow-Nametabs activated, DDL executed
2 ETP362 "1" Shadow-Nametab activations failed
2 ETP360 Begin: Act. of Shadow-Nametabs with DDL ("2019/03/29 02:42:00")
2 ETP363 End : Act. of Shadow-Nametabs with DDL ("2019/03/29 02:42:12")
2 ETP301 ----------------------------------------------------------------------
1 ETP180 UNKNOWN ACTION
1 ETP110 end date and time : "20190329024212"
1 ETP111 exit code : "8"
1 ETP199 ######################################
4 EPU202XEND OF SECTION BEING ANALYZED END OF PARMVNT_XCNV
=================================================

Note: The affected upgrade phase is PARMVNT_XCNV.  Beginning with SUM 2.0 SP13 this phase is renamed to PARMVNT_BAS_TABS.

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• Netweaver AS ABAP
• DB2 z/OS

SAP NetWeaver 2004 ; SAP NetWeaver 7.0 ; SAP NetWeaver 7.1 ; SAP NetWeaver 7.2 ; SAP NetWeaver 7.3 ; SAP NetWeaver 7.4 ; SAP NetWeaver 7.5 ; SAP enhancement package 1 for SAP NetWeaver 7.0 ; SAP enhancement package 1 for SAP NetWeaver 7.3 ; SAP enhancement package 2 for SAP NetWeaver 7.0 ; SAP enhancement package 3 for SAP NetWeaver 7.0

-650 SQL0650N execution SUM database mainframe PARMVNT_XCNV PARMVNT_BAS_TABS , KBA , BC-DB-DB2 , DB2 for z/OS , BC-DB-DB2-UPG , DB2 for z/OS - Upgrade , Problem