avex Entertainment catalog numbers and the /B

[Secret Squirrel]

Does anyone know what the /B stands for at the end of the AVCA and AVCD catalog numbers? Here's an example

AVCA-26225/B

They are on a fair number of albums, but some sites list them and some sites don't. They seem to show up most often on the limited-edition releases that contain a DVD. I'd like to figure out when to include the /B, and whether or not there was a corresponding release that doesn't have the /B (note: the regular no-DVD releases for these albums is always a different catalog number altogether.)