Data Modification Request succeeds, but response body cannot be created

OData-Protocol, section 11.4.2: Upon successful creation of the entity, the service MUST respond with either  201 Created  and a representation of the created entity, or  204 No Content  if the request included a Prefer header with a value of  return=minimal  and did not include the system query options  $select  and  $expand, or if a representation of the created entity could not be constructed . In either case, the response MUST contain a  Location  header that contains the edit URL or read URL of the created entity.    OData-Protocol, section 11.4.3: Upon successful completion of the update, the service responds with either 200 OK and a representation of the updated entity, or 204 No Content, for example, if the request did not specify a Prefer Header with a value of return=representation and did not include the system query options $select and $expand, or if a representation of the updated entity could not be constructed .