About ViewEntity's relationship

In mantle-usl/entity/WorkEffortViewEntities.xml, ViewEntity “WorkEffortAssetAndAssign” has a tag .

What is the usage of Relationship in a ViewEntity ?

I think relationships in view entities are logical, not database constraints. And so the main value is to establish a connection with entities. This for example allows you to call .findRelated(...) or .findRelatedOne(...).