2573471 - SUM stops in PHASE PREP_INPUT_CHECK/READDATA_EXP with error: "Could not find suitable DVDs for product *NW* required for the procedure"

While performing an upgrade on Software Update Manager (SUM) tool, the following error can be seen in phase PREP_INPUT_CHECK/EXTRACTKRN_PRE:

• SAPupConsole.log

                           START OF PHASE PREP_INPUT_CHECK/READDATA_EXP

=========== Enter DVD Mount Points ===========

Could not find suitable DVDs for product *NW* required for the procedure.

The requested data carrier is not mounted on any of the mount points you
entered.

Enter at least the mount point containing *Export DVD for product NW* :

=============================================

• READDATAEXP.LOG

1 ETQ201 Entering upgrade-phase "PREP_INPUT_CHECK/READDATA_EXP" ("20171120110030")
2 ETQ367 Connect variables are set for standard instance access
4 ETQ399 System-nr = '76', GwService = 'sapgw76' Client = '000'
4 ETQ399 Environment variables:
4 ETQ399 dbs_hdb_schema=SAPABAP2
1 ETQ200 Executing actual phase 'PREP_INPUT_CHECK/READDATA_EXP'.
1 ETQ399 Phase arguments:
2 ETQ399 Arg[0] = 'EXPORTMISC:MISCS.TOC'
2 ETQ399 Arg[1] = 'INITCOMPINFO_EXPORT=CVERSEXPORT.OUT;MEDIAFLAG_EXPCTRL'
3 ETQ399 Ask for DVD 'Export DVD for product NW' with kit 'BS2016_SP01_MID'
4 ETQ399 Starting dialog 'MountPoints' at 20171120110030.
4 ETQ399 Dialog finished at 20171120153204.
3 ETQ399 Ask for DVD 'Export DVD for product NW' with kit 'BS2016_SP01_MID'
4 ETQ399 Starting dialog 'MountPoints' at 20171120153204.

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SUM

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

READDATAEXP, MountPoints, Export DVD for product NW, SEM-BW, Netweaver, ERP 6.0 , KBA , BC-UPG-TLS-TLA , Upgrade tools for ABAP , Problem