Thanks Martin
I am using JPA and Hibernate. By default in JPA the one-to-many relationships are lazy. Also my problem is not on the JPA side - it is more on the ui side.
The datatable to which I am adding new order lines do not reflect the lines (even if the underlying List<OrderLine> has the lines I added. The only thing missing is the composite PK (order_id, product_code) because I have not yet generated the order_id for the header.
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