If the target entity set is not defined in the same entity container as the enclosing EntitySet element, the entity set name must be qualified with the namespace or alias of the schema that defines the entity set, followed by the entity container. Examples: EntitySet="SomeSet" for an entity set in the same container as the enclosing entity set, EntitySet="SomeModel.SomeContainer.SomeSet" for an entity set in any container of a model in scope. Accepted: https://www.oasis-open.org/committees/download.php/48097/odata-meeting-23_on-20130130_31-F2F-minutes.html#odata-195