SYMPTOM:
When trying to duplicate a project across Project Sources in 2-tier using default Project Duplication Wizard settings , error is received after project duplication process starts, which leads to project duplication stopping:

Violation of PRIMARY KEY constraint 'PK_ADDRESS'. Cannot insert duplicate key in object 'dbo.DSSCSADDRESS'. The duplicate key value is (<ID>).
CAUSE:
This error is caused by a logical metadata inconsistency. The table referenced in the error message (DSSCSADDRESS) is a metadata table which stores contact information used by Distribution Services.
In order to track down the cause of the inconsistency, customers encountering this issue should make note of Schema-related changes, Object Migrations, or error messages prior to experiencing the problem. Change Journal, if it has been enabled, can help in preserving this information.
ACTION:
Contact Strategy Technical Support for further assistance in resolving issue.