2697575 - SUM fails in TABIM_REDUCE with error "1AETP000 wait for R3trans process failed."

While performing an upgrade, SUM phase TABIM_REDUCE crashes with an error such as the following:

Severe error(s) occurred in phase MAIN_SHDIMP/SUBMOD_SHDIMP/TABIM_REDUCE!

Last error code set:
Non single errors (code > 8) found in logfile
'D:\usr\sap\<SID>\SUM\abap\log\TABIMREDUCE.ELG': The operation completed
successfully.

*ERROR* :
Detected the following errors:

# D:\usr\sap\<SID>\SUM\abap\log\SAPL-<REL><package_name>.<SID>:
1 ETP101 transport order : "SAPK-<REL><package_name>"
1 ETP102 system : "<SID>"
1 ETP108 tp path : "D:\usr\sap\<SID>\SUM\abap\exe\tp.EXE"
1 ETP109 version and release : "380.xx.xx" "<Release>"
1 ETP198 

1AETP000 wait for R3trans process failed.

SUM upgrade

R3trans processes, TADIM_REDUCE, SAPK-731BZINSAPBW, CREATE COFILE FROM DATAFILE, SAPup process exited with status 0, wait for R3trans process failed , KBA , BC-UPG-TLS-TLA , Upgrade tools for ABAP , Problem