Sometimes tables in OracleDB store in some schemas, and they have links to each other.
Now: TMS Data Modeler support only one schema per reverse, so in reverse it' doesn't work properly with links (foreign keys) between schemas.
With future: Modeler work properly with any schemas, cross-schema foregin keys. In Aurelius mapping generation correctly support schemas, allow to create one mapping file for each schema (if they have no cross links).