I know it has been several months since this posting but I am having the same problem, however I can not find this advanced area referenced here, can anyone give me a hand with this? Thanks.

you mean that bit? Right click in the idm-console on an object, and the memu will have both a properties and advanced properties option. Alternatively, double click on the object, and there's a big Advanced button at the bottom of the window that pops up.

No, that didn't work, when I right click on an object it says edit or delete. When I edit it there is no advanced button (they must have removed it from the version I'm running: 8.1)

For future reference though, I did find it by opening the Directory Server window from the console, going to the Directory tab, then to the LDAP base I created during setup. In here I found the group I had created, right clicked on the group and clicked on advanced properties. I then clicked on object class, then click add value, selected posixGroup, then a gidnumber field gets added to the attribute list where you can enter the proper value.

Not hidden at all but now that I found it everything is working fine.

huh? That's *exactly* where I said it was..??

Really? I must have misunderstood, I thought you were referring to the user and groups tab in the console window. My bad.