3323936 - CONVT_NO_NUMBER dumps when opening My Inbox application

Symptom

Inbox applications are in Error state.

When trying to open My Inbox/My Outbox tile, the below message is shown:

Error while loading the tasks. For more information, see the details - /IWFND/CM_MGW/051 Resource not found for the segment 'TaskCollection'.

A dump is generated in the workflow system:

Category               ABAP programming error
Runtime Errors         CONVT_NO_NUMBER
Except.                CX_SY_CONVERSION_NO_NUMBER
ABAP Program           CL_SWF_UTL_BUFFER=============CP
Application Component  BC-BMT-WFM

Short text

"LOCAL" cannot be interpreted as a number

What happened?

Error in the ABAP application program.
The current ABAP program "CL_SWF_UTL_BUFFER=============CP" had to be terminated because it found a
statement that could not be executed.

Error Analysis

An exception has occurred in class "CX_SY_CONVERSION_NO_NUMBER". This exception was not caught
in procedure "GET_INSTANCE" "(METHOD)" or propagated by a RAISING clause.
Since the caller of the procedure could not have anticipated this exception, the current program was terminated.
The reason for the exception occurring was:
The reason for the exception is:
An attempt was made to interpret value "LOCAL" as a number.
As this value contravenes the rules for displaying numbers correctly, this was not possible.

Chain of Exception Objects

Level Class
Attrib. Name Value
----------------------------------------------------------------
1 CX_SY_CONVERSION_NO_NUMBER
(Program) CL_SWF_UTL_BUFFER=============CP
(Include) CL_SWF_UTL_BUFFER=============CCIMP
(Row) 46
(Short Text) The argument 'LOCAL' cannot be interpreted as a number
(Long Text) The argument 'LOCAL' cannot be correctly displayed as a number.
IS_RESUMABLE
KERNEL_ERRID CONVT_NO_NUMBER
VALUE LOCAL

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

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, IW_BEP, TASKPROCESSING, SWF_WORKFLOW, swpa, workflow, shared_memory, inbox_view_update_in_seconds, further settings, substitutions, cache, caching, fiori launchpad, my inbox, my outbox, /IWBEP/CX_MGW_BOP_RFC_COMM RFC call was not successful because of communication failure 'An exception with the type CX_SY_CONVERSION_NO_NUMBER was raised, but was not handled locally or declared in a RAISING clause.'errorfalse /IWBEP/CX_MGW_TECH_EXCEPTION An exception was raisederrorfalse
, KBA , OPU-BSC-TGW , Task Gateway , BC-BMT-WFM , Business Workflow , OPU-BSE-WFM , Gateway Business Workflow Enablement , Problem

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