2954176 - Error in MAIN_SHDIMP/SUBMOD_SHD2_RUN/XPRAS_SHD_AIMMERGE

During an upgrade using the Software Update Manager (SUM), the following error occurs in the MAIN_SHDIMP/SUBMOD_SHD2_RUN/XPRAS_SHD_AIMMERGE phase:

Detected the following errors:
/usr/sap/<SID>/SUM/abap/log/SAPR731XPRA90000148.<SID>:
1 ETP109 version and release : "380.45.04" "721"
1 ETP198
2 EPU126XPost-import methods for change/transport request: "SAPK731XPRA90000148"
4 EPU111 on the application server: "<server name>"
2 EPU122XPost-import method "AFTER_IMP_CHDO" started for "CHDO" "L", date and time: "20200731110814"
1AETR012XProgram terminated (job: "RDDEXECL", no.: "<job id>")
1AEPU320 See job log"RDDEXECL""<job id>""<sid>"

Checking the relevant job log on the shadow system directs you to ST22 where you see the following dump:

Error in the ABAP Application Program
The current ABAP program "SAPLSEUQ" had to be terminated because it
come across a statement that unfortunately cannot be executed.
The following syntax error occurred in program
"CL_WB_CROSSREFERENCE==========CP " in include
"CL_WB_CROSSREFERENCE==========CM00I " in
line 15:
"Field "P_IS_USED" is unknown. It is neither in one of the specified tables nor defined by a "DATA" statement. "DATA" statement."

• SAP ERP 6.0
• NetWeaver 7.31
• Note 1917231 is implemented on the system

update, NW 731, SHD, modify, CI , KBA , BC-UPG-TLS-TLA , Upgrade tools for ABAP , Problem