If your SYSTEM tablespace is created as LMT (the default, seems to be the case in your situation too) then all other tablespaces must be LMTs too.
So if you want to create a dictionary managed tablespace (why?????) in 9i, you must have your SYSTEM tablespace created as DMT at database creation time.
ASCII a stupid question, get a stupid ANSI
24 hours in a day .... 24 beer in a case .... coincidence?