After making a clean installation of eZ Publish 4.6, in Mysql, and upgrading to eZ Publish 4.7 final, build 206, I get the following in the Database Consistency Check:

The database is not consistent with the distribution database.

To synchronize your database with the distribution setup, run the following SQL commands:

DROP TABLE ez_ct_change_entry;
DROP TABLE ez_ct_change_log;

Steps to reproduce

1. Make a clean installation of Ez Publish 4.6
2. Register in Service Portal
3. Run Sync_Network cronjob
4. Run Monitor cronjob
5. Upgrade to eZ Publish 4.7 rc1
6. Run Sync_Network cronjob 
7. Run Monitor cronjob
8. Make a Database Consistency Check