Hi avishnev,
I’m not sure which tutorial you are following since we have several. The GWT scaffolding requires you to select all tables as parents because the generated GWT code assumes you have CRUD services for all tables. We have a GWT tutorial that conveniently glosses over that fact. I will try to get that tutorial updated with that information. http://www.myeclipseide.com/documentation/quickstarts/ME4STutorialScaffoldingGWT/scaffoldinggwtarticle.html
As far as how to get a 1:M relationship, presumably the generated GWT app is a superset of what you need so you would need to modify the generated GWT client to remove the unnecessary pieces.
Please post further questions that are not related to RequestFactory validation as new topics so we can keep this thread focused on it’s original topic.
Thanks,