How to set doDML precedence in VO with multiple EOs

Hi All
I' developing a web app using jdeveloper 11.1.1.3
I have 3 EOs with have references each other
I created a single VO using these 3 EOs
when I excecute the Commit methos the doDML method in second EO will be called, But I want to get called in first EO's doDML
Pls tell me how to do this
Tx
Padma

Is the relationship between the EOs defined as composite?
http://download.oracle.com/docs/cd/E17904_01/web.1111/b31974/bcentities.htm#sm0150

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