Model Subsetting

In some circumstances, only a subset of a model is available. These include when users do not have sufficient security permissions, when there are missing items in the physical model, when the model is derived from another model, or when the designer explicitly created a model subset.

When only a subset is available, missing items from the semantic model can affect other items within the model. For example, dependent items within the model are treated as if they have been removed from the model as well. If a reference is mandatory, for example, when specifying the Binding or RelatedRole elements, the referencing ModelItem element is treated as missing. Similarly, the innermost optional property, for example the Inheritance element, is treated as empty. References in queries to missing items generate a warning instead of an error, and the innermost containing detail, group, hierarchy, measure, measure group or subtotal set is omitted from the query. In the event a base entity is missing or all groups and all measures are omitted, the query fails.