I am using jboss seam, In my code i am using @StateFul session,Session scope and extended persistence context. when i am going to update the current object using entity-manager.merge(obj) and entity-manager.flush() ,the current is updated successfully. my problem is when i select one object(ex obj1) for update and give some fields to that object ,the provided data is failed based on my logical conditions ,so its not updated ..and i omit that object and select and another object(ex obj2) and provide some correct information to that object(obj2),when i am going to update that current object (obj2) the previously selected objects(like obj1) which is not updated,all those objects is updated with current object(obj2)......... plz slove my problem,

   @Stateful
@Name("CustomerAction")
@Scope(ScopeType.SESSION)
public class CustomerAction implements
    CustomerInterface {

@PersistenceContext(type = PersistenceContextType.EXTENDED)
private EntityManager  entityManager;
    private String name;
    Customer selectobj;---->entity
public void objectSelected() {
    ((org.hibernate.Session) entityManager.getDelegate())
    .setFlushMode(org.hibernate.FlushMode.MANUAL);
    selectobj = (Customer) entityManager.createQuery(
            "from Customer where custName=:id").setParameter("id",name)
            .getSingleResult();
    entityManager.refresh(selectobj);
}
@Transactional<br>
public void update() {
if (selectobj.age<18) {
        facesMessages
                .addToControl("messages", Severity.ERROR,
                        "Age should be greather than 18");
        return;
    }

        selectobj.setModifiedBy(user.getUserId());
        selectobj.setModifiedDate(currentDate.getCurrentDate());
        entityManager.merge(selectobj);
        entityManager.flush();
        entityManager.refresh(selectobj);

}
@Destroy
@Remove
public void destroy() {
}  
}