I have an entity MainEntity
MainEntity has a collection of ChildEntity.

I do the following:
1. ChildEntity ch = new ChildEntity();

2. MainEntity me = getMainEntity(mainEntity ID); // this will retrieve the MainEntity from database
3. ch.setMainEntity(me);
4. me.getChildEntityCollection().add(ch);
5. EnittyManager.merge(me).

This cause 2 inserts for Child entity.

The primary key for the entity is auto generated.
The child entity is lazily loaded in Main Entity.

I also noticed that in the debug mode when I put a breakpoint before merging, and force lazily load the childEntityCollection, then only one row gets inserted.

Any help is appreciated.

Thanks,
Alpha7