In the column "Region/State" im using ISO-3166-2-Codes for Germany (https://de.wikipedia.org/wiki/ISO_3166-2:DE) , but Magento is showing me this Message:
How can I solve this ?
In the db table
directory_country_region we can see country codes and region/state codes of every country. The value of "Region/State" (of tablerates.csv) must be in the same format as in that table. The table content can be seen via phpmyadmin.