Update api call insists on mandatory fields when selecting rows by non-"id" key.

There is (rumored to be) some API logic which skips the mandatory field check when the Create is actually an Update, and that is detected by checking whether the "id" field is present in the call params.

I'm trying to do an update on contribution_recur, but selecting a row by "trxn_id". The API does not detect that this is an update, and enforced the Create mandatory fields.