When opening 'Custom CDS Views' Fiori app , you see the waiting screen.
You can see the error on HTTP Trace (F12 Developer tools)
GetResponse 403 Forbidden
SAP Fiori Launchpad
GetResponse,403,cds , KBA , BC-SRV-APS-GKE , Generic CDS Key User Editor , CA-FLP-ABA , ABAP Services , Problem
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