I wanted to see something similar but pulled via association API, suppose using CRM owners API I get 2 owners, I wanted to get the list of all the companies where they are associated as a owner.
Right now if I use the CRM association API providing owner ID, fromObject as owner, toObject as companies, I dont get any result.
Although in the portal I know that this specific owner is associated with 2 companies (ABC,XYZ).