2831557 - My Inbox substitute user search failed - System error

Symptom

Substitute user search terminated with System error. For more information, check the details or contact your system administrator. error message in My inbox Fiori application.

AND

the following dump has occurred in backend system:

Category     ABAP programming error
Runtime      Errors UNCAUGHT_EXCEPTION
Except.      CX_BADI_MULTIPLY_IMPLEMENTED
ABAP Program WF_SUBSTITUTE=================CP
Application  Component Not assigned

Short text

An exception has occurred that was not caught.

What happened?

Exception 'CX_BADI_MULTIPLY_IMPLEMENTED' was raised, but it was not caught anywhere along the call hierarchy.
Since exceptions represent error situations, and this error was not
adequately responded to, ABAP program'WF_SUBSTITUTE=================CP'had to be terminated.

Soure Code Extract 

 field-symbols: <cl_name> type classname.
 if ctx is initial.
>>> raise exception type cx_badi_initial_context.
 endif.
 get %_badi-implementations proxy.
 if proxy is initial or proxy->imps is initial.
 raise exception type cx_badi_not_implemented.

Environment

Task Gateway
Gateway Business Workflow Enablement
SAP Business Workflow
SAP NetWeaver
SAP Web Application Server for SAP S/4HANA
ABAP PLATFORM - Application Server ABAP
SAP Gateway
My Inbox Fiori Application

Product

ABAP platform all versions ; SAP Gateway all versions ; SAP NetWeaver all versions ; SAP Web Application Server for SAP S/4HANA all versions

Keywords

SAP_GWFND, IW_PGW, /IWPGW/TGW, /IWWRK/WORKFLOW, SWF_WORKFLOW, Multiple implementation, multiple use,
/IWPGW/CL_TGW_EDP_TASK, ACTION_SEARCH_USERS, get_tgw_configuration, lv_usersearch_enabled, Task Gateway Service Settings, Enable User List, can not add substitutes, user search not working, user search disabled, /IWPGW/TGW_SERVICE, 010, /IWPGW/TGW_SERVICE/010, HTTP request failed400, Bad Request, METHOD WF_SUBSTITUTE=================CP, WF_SUBSTITUTE=================CM000, WF_SUBSTITUTE=>GET_INSTANCE, CL_EX_WF_SUBSTITUTE=>IF_EX_WF_SUBSTITUTE~RESTRICT_PROFILES, SY-XFORM SAP_WAPI_SUBSTITUTE_PROF_GE, WFMSTD, TGW_STD , KBA , OPU-BSE-WFM , Gateway Business Workflow Enablement , BC-BMT-WFM , Business Workflow , CA-INB-FIO , Fiori UI for My Inbox Application , OPU-BSC-TGW , Task Gateway , Problem

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