There has been a report of the 'zip4' address type not successfully entering data in an import. The import type was a voter file, and the rest of the address data was entered as expected. No error reports were produced, but the zip code fields in voters profiles remained blank.
This error was caused by problematic field mapping. To map Zip+4 data, one column should contain the first five digits of the code (mapped to zip5) and a second columns should contain the last 4 digits of the code (mapped to zip4).