2593650 - SUM Error "CONVT_NO_NUMBER" in phase PREP_EXTENSION/EHP_INCLUSION or UPLOAD_FIRST

Upgrade using Software Update Manager (SUM) fails with error "CONVT_NO_NUMBER".

Error symptom noticed in two phases PREP_EXTENSION/EHP_INCLUSION & PREP_EXTENSION/UPLOAD_FIRST with error logs below:

EHP_INCLUSION.LOG:

1EETQ235 Call of function module "SPDA_DISASSEMBLE_QUEUE" by RFC failed (error-status "3")
2EETQ360 RFC of "SPDA_DISASSEMBLE_QUEUE" failed:
2EETQ361 code/exception : 3
2EETQ362 key : CONVT_NO_NUMBER2EETQ399 ######## cannot be interpreted as a number

Or,

In phase PREP_EXTENSION/UPLOAD_FIRST, UPLOADFIRST.LOG contains below error lines:

1EETQ235 Call of function module "SPDA_PREPARE_PATCH" by RFC failed (error-status "3")
2EETQ360 RFC of "SPDA_PREPARE_PATCH" failed:
2EETQ361 code/exception : 3
2EETQ362 key : CONVT_NO_NUMBER
2EETQ399 H
2EETQ399 INFOV cannot be interpreted as a number
4 ETQ010 Date & Time:
1EETQ399 Last error code set is: RFC system 'XXX' nr '0X' function 'SPDA_PREPARE_PATCH'
1EETQ399 RFC failed with code 3
1EETQ399Xkey CONVT_NO_NUMBER:
1EETQ399XH
1EETQ399XINFOV cannot be interpreted as a number
1EETQ204 Upgrade phase "UPLOAD_FIRST" aborted with severe errors ("")

Generated ST22 dump:

Category ABAP programming error
Runtime Errors CONVT_NO_NUMBER
Except. CX_SY_CONVERSION_NO_NUMBER
ABAP Program CL_SPDA_EPS_FILE_READER=======CP
Application Component BC-UPG-OCS

• Software Update Manager (SUM)
• SAP Netweaver AS ABAP

UPLOAD_FIRST, CL_SPDA_EPS_FILE_READER=======CP, SPDA_PREPARE_PATCH, SUM, DVD, Software Update Manager, upgrade, update, PREP_EXTENSION, PREP_EXTENSION/EHP_INCLUSION, EHP_INCLUSION, PREP_EXTENSION/UPLOAD_FIRST, upload, Check, Disassemble, package, EPS/in, DIR_TRANS, CONVT_NO_NUMBER, cannot be interpreted as a number, SPDA_DISASSEMBLE_QUEUE, error-status "3", code/exception : 3
, KBA , BC-UPG-TLS-TLA , Upgrade tools for ABAP , Problem