3739810 - IW_FND: Preparing component uninstallations failed in SUM

Getting error in SUM phase PREP_EXTENSION/UNINSTALL_PREPARE, following error observed:

...
2 ETQ399 Preparing Component Uninstallation(s) ...
2 ETQ399 ... Component(s) to be uninstalled:
4 ETQ399     -> GW_CORE
4 ETQ399     -> IW_FND
...
2 ETQ373 Parameter "EV_MESSAGE" = "Plugin class /IWFND/CL_UNINSTALL__PLUGIN does not exist (see SAP Note 3103648)"
2 ETQ399 Table ET_PATQ (#0):
2 ETQ399 Table ET_UNINSTALL_NOTES (#0):
4EETQ399 Preparing component uninstallations failed, rc = "-99", reason = "Plugin class /IWFND/CL_UNINSTALL__PLUGIN does not exist (see SAP Note 3103648)".
1EETQ399 Last generated error message is: Error during prepare of component uninstallations. Return Code = -99, Reason =
1EETQ399X"Plugin class /IWFND/CL_UNINSTALL__PLUGIN does not exist (see SAP Note 3103648)", check log file
1EETQ399X'SPDA_UNINSTPREP.LOG' for details!
1EETQ204 Upgrade phase "UNINSTALL_PREPARE" terminated with severe errors ("<timestamp>"). 

• SAP ERP

sum, abap, prep_extension, uninstall_prepare, /iwfnd/cl_uninstall__plugin, plugin class missing, spda_uninstprep.log, ev_rc -99, iw_fnd, gw_core, spda_prepare_uninstallations, configuration phase, upgrade failure, s/4hana conversion, gateway add-on uninstall , KBA , OPU-GW-COR , Framework , Problem