attribute customization: call rest service
One answer
Hello Milan,
you may want to refer to 2 articles Ralph authored:
http://rsjazz.wordpress.com/2012/07/31/rtc-update-parent-duration-estimation-and-effort-participant/
and
http://rsjazz.wordpress.com/2012/11/27/resolve-parent-if-all-children-are-resolved-participant/
Though not exactly matching your request, you may find interesting code sample.
Hope it helps.
Eric.