* Usually this command is enough to call PAI/PBO by force
CALL METHOD cl_gui_cfw=>set_new_ok_code 
    EXPORTING 
      new_code = 'DUMMY'. 

* If not, try this one additionally (available only with SAP GUI for Windows)
CALL FUNCTION 'SAPGUI_SET_FUNCTIONCODE' 
      EXPORT 
       FUNCTIONCODE = '/00' 
      EXCEPTIONS 
        FUNCTION_NOT_SUPPORTED = 1. 

* Synchronize Application Server and Frontend data, just to be sure :)
CL_GUI_CFW=>FLUSH.

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