GET Related Records Data does not respond to fields Query Parameter
I am trying to get a list of emails linked to a Contact, using the GET Related Records Data API call. It works if I want all the record fields. However, although the V2 guide specifies a "fields" Query Parameter, this is ignored. So even though I use a URL in the form
https://www.zohoapis.eu/bigin/v2/Contacts/{contact_record_ID}/Emails?fields=Subject I get all the fields, not just the Subject. I notice that the V1 guide does not support a Query Parameter. Is V2 actually working as specified?