Deep insert: if server responds with 201 Created it MUST respond with at least the expansion depth of the insert operation

If the server applies the preference return=representation when responding to a deep-insert request, it MUST expand the response to at least the level that was present in the deep-insert request. Accepted: https://www.oasis-open.org/committees/download.php/49125/odata-meeting-36_on-20130509-minutes.html#odata-368