title: relations using JPA persistent
body: <p>I would like to know if there is relations between two entity's for instance <strong>salesOrder</strong> entity and <strong>SalesOrderItem</strong> with relation <strong>one to many</strong>
  how should i persist them,i.e. do i need to keep the order  and relations or there is a way to 
  divide the persist and first for example start with sales order item and than the sales order.
  this is just example, i want to know if there is a way to <strong>ignore the relation</strong> during the persistence with the JPA
  and persist the object without any needs to refer to the relations,but of course if there is foreign key provide it at  a time </p>