2233250 - Error: ASSERTION_FAILED for ABAP program /SCMB/CL_DF_DOCUMENT_TYPE=====CP during upgrade phase XPRAS_AIMMRG

You see following error in SUM, during upgrade phase XPRAS_AIMMRG :

*ERROR* :
Detected the following errors:

# /usr/sap/install/SUM/abap/log/SAPR740XPRA90000153.APZ:
1 ETP109 version and release : "380.36.74" "742"
1 ETP198
2 EPU126XPost-import methods for change/transport request:
"SAPK740XPRA90000153"
4 EPU111 on the application server: "xxxxxxx"
2 EPU122XPost-import method "/SCMB/DF_GENERATE_AFTER_IMPORT" started for"/SCMB/V_DF_DCTP" "V", date and time: "20151029155555"
1AETR012XProgram canceled (job "RDDEXECL", number "15555400")
1AEPU320 See job log"RDDEXECL""15555400""xxx"

When this occurs, you will find an ASSERTION_FAILED runtime error dump for ABAP program /SCMB/CL_DF_DOCUMENT_TYPE=====CP in transactoin st22, similar to the following :

Category ABAP Programming Error
Runtime Errors ASSERTION_FAILED
ABAP Program /SCMB/CL_DF_DOCUMENT_TYPE=====CP
Application Component SCM-BAS-DF
Date and Time 07.11.2015 21:21:15

Short Text
    The ASSERT condition was violated.

System based on SAP NetWeaver

Software Update Manager, upgrade, SUM, dump, ST22 , KBA , SCM-BAS-DF , Cross-System and Cross-Partner Document Flow , BC-UPG-TLS-TLA , Upgrade tools for ABAP , Problem