You are using Web Dynpro reports (Cost Centers - Actuals etc.). You find from CE2108 release, the additional fields like WBS Element are not available anymore.
SAP S/4HANA Cloud
cost centers, actuals, plan, journal entry, text, project, wbs element, I_JournalEntryItemCube, custom logic, extensibility, key user, data source. , KBA , CO-FIO-OM-IS , Reporting , Problem
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