SSG Group address modification

Hi

I would like to remove the one address from only group entry, leave the entry, what is best way to remove from group entry?

1)

set group address “inside” "SERVER” add "10.10.10.1”
set group address “inside” "SERVER” add "10.10.10.2”

I tried use "unset" command but looks like it is not taken.

unset group address “inside” "SERVER” add "10.10.10.1” ===>it generates "unknown keyword"

2) when I add address book, some screen os is fine without "" but some time it doesn't take.

Is this because of the OS version?

For ex: when i add below entry, some of the ssg fw, it takes but some of them, I had to remove the ""

set group address “inside” "SERVER” add "10.10.10.1”

Thanks