[jboss-user] [JBoss Seam] - Strange behaviour on seam 2 and tomcat 6

[Stateless Bean]

Hi,
Can anyone explain me what is going one?
I got collection mapped (one directional) from planet->buildingsProd class like this
	

  | @OrderBy("index ASC")
  | @OneToMany(cascade=CascadeType.ALL, fetch=FetchType.LAZY)
  | @JoinColumn(name="Planet_idPlanet")
  | public List<BuildingsProd> getBuildingsProdList() {
  | 	if (buildingsProdList == null)
  | 		buildingsProdList = new LinkedList<BuildingsProd>();
  | 	return buildingsProdList;
  | 

and when I load my planet

  | Planet planet = em.find(Planet.class, idPlanet);
  | 
and add new object to collection		
		
		
  | BuildingsProd b = new BuildingsProd();
  | planet.getBuildingsProdList().add(b);
  | em.merge(planet);
  | 

new object should me inserted into db with my planet key and here is my question. 
This works fine on JBoss 4.0.5 but on tomcat with jboss embedded new object is inserted into db but withoud planet FK key!!!
Why, and what is wrong here?

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