Database transporter fails with the the following error when importing transport file:
 Database error 50000: Could not propagate CustomSQL : sysdiagrams.UK_principal_name
An explicit DROP INDEX is not allowed on index 'sysdiagrams.UK_principal_name. It is being used for UNIQUE KEY constraint enforcement.
Uncommittable transaction is detected at the end of the batch. The transaction is rolled back.
Issue fixed in version 7.1.2. The latest version of Identity Manager can be downloaded here.