I am submitting this feature request on behalf of an active project we have with the Surrey Police Services. We have spoken to the LEI product management team about this requirement, and they advised it would need to be submitted as a feature request.
Our client requires fields from child entities be available for selection as output fields in searches. For example, when searching on conditions relating to a document (i.e. general occurrence document) and a child entity (vehicles on the general occurrence) there should be a method to bring back both fileds associated with the document and the child entity.