Left outer joins cannot be created between inner joins. They can only be created at the end of an assignment chain.
A union can only be created at the end of an assignment chain. Joins cannot be used in a union.
With HybridProviders that consist of a DataStore object and an InfoCube, only the InfoObjects of the InfoCube can be assigned.
The technical characteristics "Request ID" (0REQUID) and "Record Type" (0RECORDTP) cannot be assigned. They are automatically assigned at runtime. Technical characteristic 1ROWCOUNT is not displayed. If it is in one of the participating providers, it is added automatically as a key figure.
Non-cumulative key figures and other key figures with special semantics (such as elimination of internal business volume) must have a 1:1 assignment to the structure of the CompositeProvider. The Direct Usage of Associated Object by Name property also has to be set.