I happen to find IBM Japan's export control web site, which advice general export control policy of IBM Japan and the procedure of providing the classification statement (in Japanese!).
I like this site, this is really neat and concise, explaining embargo country policy, what is classification is, and what kind of their product is under control with very simple manner so that normal business people can easily understand.
One thing noteworthy is that IBM Japan declare they "don't issue parameter sheet". Perhaps this implies they issue self-classification statement whether the product is controlled or non-controlled and ECCN, but don't provide technical specification with parameter sheet as supporting document. This practice is actually not welcomed in Japanese business society, most of Japanese customers who intend to export the products by themselves strongly require parameter sheet by manufacturer. IBM Japan's decision is operational-friendly, but may not be customer-friendly in Japanese business perspective. I would like to see whether their practice will be accepted in Japan.