Failed to create new entry after import data from csv

I am using the develop branch. After upgrade to 8.x, the creating new entry will be failed after import data from CSV.

e.g. I have a doctype named region, I will got error “Duplicate name Region RGN000001” after imported data from csv.

Hi @srdgame,
Have you downloaded the template after upadating your version?

I have not found any difference in csv files exported in new/old frappe. Is there any more information which will affect the tabSeries?