[Django]-Recovering from a duplicate migration in Django South

From the docs: http://south.readthedocs.org/en/0.7.6/autodetector.html

When the autodetector runs, it compares your current models with those
frozen in your most recent migration on the app, and if it finds any
changes, yields one or more Actions to the South
migration-file-writer.

The migrations keep a frozen version of the fields within the model in a dict.

Therefore:

In 0005_auto__add_field_organisation_permitted_domains the Organisation class will have a field permitted_domains but in 0005_auto__add_field_userprofile_currency it will not. When you run:

$ python manage.py schemamigrate accounts --auto

this will compare the current state of the code against the record of the fields store in 0005_auto_add_field_userprofile_currency, thus leading south to add the field for a second time.

If you copy the line for the ‘permitted_domains’ field from 0005_auto__add_field_organisation_permitted_domains to 0005_auto__add_field_userprofile_currency this will solve your problem.