I have a site with nearly 300 separate access levels (lots of subsites and separate administrators). This leads to problems when trying to set the access level for an edocman category, because the "access" field in the #__edocman_categories table cannot contain values larger than 255 with its current definition.
I suggest you change the column definition to something like the one used for #__content:
Code:
access int(10) unsigned default 0