Duplicate Supplier rejection in Expense report

We have many of these cases coming up.

For e.g. A resource is an employee say from 2006-2008. He has submiited various expense reports and was paid

He is termed and rejoins back in 2012

Now when expense report import is run the expense get rejected with error "Duplicate Supplier"

as already the name exists in AP and the supplier type is Employee.

Is there an alternative resolution for this type of case

Thanks

Ninad