2626799 - Getting error when trying to Open WebGUI and WebDynpro Apps

• An SAP Web Dispatcher is used as an entry point for a Fiori landscape.
• The SAP Web Dispatcher was configured per the relevant Fiori / UI Technology Guide.
• Besides using Fiori, other Web UI (User Interface) technologies are being used (like the WebGUI/ITS or WebDynpro).
• However, they do not work correctly if the access is performed through the Web Dispatcher (for example, the logon page does not work, dropdown menus do not work, ...).
• Direct access to the backend presents no issues.
• The error messages This application cannot run in that Frame or The current transaction must be terminated may be shown

• SAP Netweaver release independent
• Client/Server Technology - Web Dispatcher
• Frontend Services / SAP Internet Transaction Server
• Frontend Services / SAP GUI for HTML
• Web Dynpro / Web Dynpro ABAP
• Web Dynpro / Unified Rendering
• Cross-Application Components / Frontend / SAP Fiori Launchpad
• Cross-Application Components / SAP UI5 / SAP UI5 Core and Runtime
• Cross-Application Components / SAP UI Integration / SAP Fiori Launchpad services
• Cross-Application Components / SAP Fiori Launchpad / SAP Fiori Launchpad (ABAP Services)
• Cross-Application Components / SAP Fiori Launchpad / SAP Fiori Launchpad Core (Client)

Web gui, Fiori 1.0, Fiori 2.0, #SAPFiori, #SAPFLP, WDA, S4FIN_HTTPS, SSO, MYSAPSSO2, X-Frame Options, Fiori launchpad, 500 internal server, Web Dynpro, This application cannot run in that Frame, The current transaction must be terminated, , KBA , CA-FLP-FE-AI , Fiori Launchpad Application Integration , BC-FES-WGU , SAP GUI for HTML , BC-FES-ITS , SAP Internet Transaction Server , BC-WD-UR , Unified Rendering , BC-WD-ABA , Web Dynpro ABAP , BC-CST-WDP , Web Dispatcher , CA-UI5-COR , Core and Runtime , CA-FLP-ABA , SAP Fiori Launchpad ABAP Services , CA-UI2-INT-FE , Please use CA-FLP-FE-COR , CA-FE-FLP , SAP Fiori Launchpad , CA-FLP-FE-COR , SAP Fiori Launchpad Frontend Core and Services , Problem