Data Warehouse OData Service Menu link is not visible under the Administration menu -> General Settings.
This occurs if Odata service has not been configured with your environment.
Release : 15.7.0
Component : CA PPM SAAS ODATA
Please create a ticket with Broadcom Support to get this enabled. Once it's enabled and have the necessary rights you will be able to see the link.
For More Information on the access rights please refer to this KB Article.