Custom WDA from standard SAP WDA

Hi All,

I am having a requirement to call a custom WDA application from standard leave EHP5 WDA application once "Send" button is pressed.

I will be running few checks once the button has been pressed & if checks are passed the custom WDA would be launched.

My intention is to complete the standard application's processing first & if it is successfully completed then only launch the custom WDA.

Initially i thought if i could call the wda URL directly from some RFC or may be create a parameter transaction for the wda & launch it.

IT looks like this isnt working. now i think i may have to enhance the standard application (user exit?) & write the piece of code to launch the external window.

Any ideas would be highly appreciated on the same. thanks.