webdynpro app expires if another embedded app URL is accessed and revisited

Hi,

I have embedded the URL of another webdynpro application in my main webdynpro application. Both the applications ask for authentication. After logging onto my main application, if access the second(embedded application),

and return back to the main application, the URL of the main application expires even if I logon to both the applications with the same UME user.

Can you please suggest the reason why this is happening?

Thanks and Regards,

Smriti.