Change line items from sets to lists

Hi ,
I wrote a report about this.
Please look:

I ran across this so I thought I'd add some notes from when I more actively built with the JPA:

It used to be true that Hibernate (which is currently backing our JPA) treated a List as an unordered collection. Meaning if you didn't specify an orderby type of attribute on the relationship, and use the DB for ordering, a List wouldn't necessarily have any guarantee of insertion order. This would need to be verified with today's Hibernate and JPA. Also a Set isn't necessarily unordered, e.g. LinkedHashSet and TreeSet in the collections api can be ordered sets, insertion and natural respectively. However I do recall that mapping Sets with JPA and Hibernate had more tricky spots than I can fully remember now. Maybe it's improved.