¿Where can i find data model explanation of Baan V?

I find that the term 'data model" has long since stopped meaning the same to everyone. The official Baan data model is not published to the best of my knowledge.

If you have a more specific question, somebody might be able to answer you though.

In the mean time, maybe this thread is helpfull:

http://www.baanboard.com/baanboard/showthread.php?t=23281