default_file in subfolder

Hi,

the HANA .xsaccess file offers the property default_file. Is is possible to set the default_file to a file in a subfolder?

e.g. the package of our application is /app and we have an index.html in folder /app/ui/index.html

Now I want to set the property "default_file" to "ui/index.html", but this doesn't work.

Could I do this with URL rewriting?

Regards,

Michael