Documentation on Bing-Map supported geo data

Hi,

I am trying to use the Filled Map.  I am getting the following message.

"To create a filled map, the location data should include Bing Map-supported geographic data, such as country/region, state/provice, or postal code"

Is there documentation on what are the Bing Map-supported geographic data?  I have two letter codes for for countries. 

Thanks.

Eric