UBB.threads PHP Forum Software Community Forums UBB.threads 7 Version 7 Support Fourm IDs and Parent Relationships

Two questions: Is there a restriction on either how many foums can be on a board or the length of the forum ID? (ie. would "3042" be a legitimate id?

Also, how deep can parent replationships go? I want to set up the relatships as follows: CATEGORY - Subject - Secondary Subject - Region.

It doesn't seem to be working. Any thoughts?