[yasinaydin]

This also happened in Turkey on a massive scale. When the government implemented the 11-digit national identity numbers for the first time in early 2000s, there have been thousands of cases where the same ID number was given to the multiple people, and also many other citizens with no ID number.

Some reported that it was due to the ID number field in database not being a primary/unique key in database. The leaked Turkish citizenship database also confirms this, although we don't know if that leak reflects the original database structure.