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What changes can I make to the zip code cross reference file?

Overview

I need to understand what changes I can make to the zip code cross reference file in SalesTaxII.

Environment

SalesTaxII

Resolution

You can change the file zip plus four codes in two ways. You can code zip plus four cross reference records to be in the
unincorporated area of a county, or code zip plus four cross reference records to point to specific cities.