We have an SQL-based ODBC user directory connector. The usernames being returned from this user directory connector is non-unique. The same username may be used by two different users. We expected, based on the documentation, that this was supported via the unique ID field in the table definitions. However, when we sync users, users are merged based on username, so only one user record is added in the QMC for each username, even if there are multiple users with different distinct ID fields for that same user.