When creating a new Employee via import, after importing the Basic User Data you encounter an error message (Person ID External already exists error)There is already another person in the system with the same Person ID External] when validating/importing Biographical Information for a user,

Cause

The issue here could be that the Person ID for your employee was created via Biographical Information import before the Basic User Data was created. This is possible as mentioned above, you can create a Person ID via import that is not associated with a User ID, as this is how Dependents are created. This can happen when the Employee was created via import but the data import was performed in the wrong order.should always be Basic User Data > Biographical Information > Employment Details > Job Info > Personal Info ,when creating a New Hire in Employee Central.