When registering a table, we also query FK relationships. As part of that process, the Sybase ASE ODBC Driver needs to create temporary tables, like #ofkey_res. However, if the user does not have write access, then this will fail. This is nothing Datamaker has control over since the Sybase ASE driver is responsible for this.
If you only have write access for the user in one profile, like the target, we suggest registering the table from the target, rather than the source.