Successfactors Employee Central: Query data from multiple entities / SFAPI objects

We have following org structure in Successfactors Employee Central (EC).

Company
-- Business Unit

I want to read company details and all the business units under that company. To achieve this I need to have company code in business unit entity to find co-relation. However, FO_businessUnit SFAPI does not have company code details. Can anyone tell me how I can achieve this requirement using SFAPI?

Regards,

Netrey