2898917 - Purchase Requisition details do not load in My Inbox app - SAP S/4HANA

Symptom

My Inbox app does not load purchase requisition work items properly (e.g. endless load), therefore the approval process can't be executed.
In transaction /N/IWFND/ERROR_LOG and in browser console, the following error appears: "Invalid URI segment".
Purchase requisition details are empty/not displayed in My Inbox app.

"Image/data in this KBA is from SAP internal systems, sample data, or demo systems. Any resemblance to real data is purely coincidental."

Environment

SAP Fiori
SAP S/4HANA
Task Gateway
My Inbox app

Product

SAP S/4HANA all versions

Keywords

C_PURREQUISITIONITEM_FS_SRV, /IWFND/CM_CONSUMER122, WS00800157, TS00800547, WS00800173, TS00800548, WS02000458, TS02000702, WS02000471, TS02000714, WS02000434, TS02000677, console log sap/opu/odata/IWFND/CATALOGSERVICE;v=2/Annotations(TechnicalName='C_PURREQUISITIONITEM_FS_ANNO_MDL',Version='0001'), flexible workflow objects load hanging, visualization type, service=/sap/opu/odata/sap/C_PURREQUISITIONITEM_FS_SRV, C_PurRequisitionItemFs, PurchaseRequisition, TASKPROCESSING , KBA , MM-FIO-PUR-REL , Fiori UI for Purchasing Approval , CA-INB-FIO , Fiori UI for My Inbox Application , OPU-BSE-WFM , Gateway Business Workflow Enablement , OPU-BSC-TGW , Task Gateway , MM-PUR-GF-WOF , Workflow , Problem

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