Certain European countries require that the postal code appears in a different place from standard UK and US postal addresses. Some countries will require it like this:
Address Line 1
Address Line 2
Postal code Address Line 3
Address Line 4

In order to change your address formats to the second one listed here, go into the registry and browse to HKEY_CURRENT_USER\Software\Actinic\Catalog8\Sites\[Site Name] (where [Site Name] is the name of your site.
Do a right click and select 'new string value'
Give it a name of 'AddressFormat' and a value of '2'.