Webdynpro for ABAP not closing browser window after click Exit

Hi Experts,

We come across a minor problem when executing a Webdynpro for ABAP on our Production Portal.

We have a "Exit" button which suppose to close the browser window with the webdynpro codes called but it failed to do so.

The execution steps of the Webdynpro app:

     Click  "Exit"

     Click  "No"

     Results message in the browser:

The code we use to exit and close the Web Dynpro application

* Code to close the application when the WebDynpro is executed

* as an independent application

* Also requires an Outbound Plug (GO_EXIT) in the main Window

  data : lr_ref      type ref to ig_main_window.

  lr_ref = wd_this->get_main_window_ctr( ).

  lr_ref->fire_go_exit_plg( close_window = abap_true ).

What would be the issue causing this, the Webdynpro codes or Portal config?

Our systems are SAP NW 7.31 with:

• ECC6 (Basis 731 SP10)
• Portal (Basis 1000.7.31.7.0.20130227234100)

Thank you for your help & advise.

Derek Phung