i deleted the document I had on the api, I'm pretty sure you'll need a value there. Based on a web search I found this:
http://answers.google.com/answers/threadview?id=429083
from the above you'll need a '1' if I read it right (a 2 would be a business address)'
to get the xml/API docs you'll need to get a developers key from ups. your viart rep may have a copy will all the parameters.