changing an entity proxy within request in GWT editor framework

I try to build an application based on spring-roo generated GWT code. now I want to do this scenario.

class Foo{      List<Bar> barList;  }  class Bar{      Foo foo;  }  

and barList is owned entity collection for Foo, that means Bars will be saved in Foo crud scenario. but foo link in Bar is not set automatically and I got a constraint violation.

I want to find best place for setting foo link in each newly created Bar. where can I create such link in an application with spring roo gwt application architecture like or generally in an mvp gwt application which used editor framework and request factory?

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