How the Post Code and City Fields Are Filled In
If you fill in Post Code field with a post code that is linked to a single city in the Post Code table, Microsoft Dynamics NAV fills in the City, Country, and County fields automatically. If there is more than one city linked to the post code, Microsoft Dynamics NAV displays a list of the relevant cities for you to choose from. If the post code is not set up in the Post Code table, you must enter the city manually.
If you fill in the City field before the Post Code field, and if the city is linked to a single post code in the Post Code table, the Microsoft Dynamics NAV fills in the Post Code, Country, and County fields automatically. If there is more than one post code linked to the city in the City field, Microsoft Dynamics NAV displays a list of post codes for you to choose from. If the city is not set up in the Post Code table, you must enter the post code manually.