CRM api - Sales Order get_relatedlist_products

CRM api - Sales Order get_relatedlist_products

The docs appear to have conflicting information on related records:

This
https://www.zoho.com/crm/developer/docs/api/getrelatedrecords.html#Request_URL
claims that all modules and lists are supported.

But this
https://www.zoho.com/crm/developer/docs/api/v2/get-related-records.html
claims that only certain modules support it.

What I need to do is get the Product records related to a Sales Order. Is this not possible? If not this is a major shortcoming! Why even make it possible in the app if you can't retrieve it via API?