Add charging model to review model relationships #1120
Merged
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https://eaflood.atlassian.net/browse/WATER-4196
Our billing engines work on the basis of starting by selecting the appropriate billing accounts, then the data needed to generate bills for them.
This means we are going from charging information (charge versions, references and elements) to review information (also charge versions, references and elements!)
When we created the review models, we included the relationships to link them to charging information. But we didn't do the same on the charging side.
In order to generate the bills, we need to be able to link from that direction, hence this change.