Character semantics when setting the length of NVARCHAR2 field (Oracle 10g)

SQL> CREATE TABLE viv_naseleni_mesta (
2 naseleno_mjasto_id INTEGER NOT NULL PRIMARY KEY,
3 ime NVARCHAR2(15 CHAR) NOT NULL,
4 oblast_id INTEGER NOT NULL REFERENCES viv_oblasti(oblast_id),
5 grad CHAR NOT NULL CHECK (grad IN (0,1)),
6 de_timestamp TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
7 de_update_time TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
8 de_operator INTEGER DEFAULT NULL,
9 de_versija NUMBER(5,2) DEFAULT NULL
10 );
ime NVARCHAR2(15 CHAR) NOT NULL,
ERROR at line 3:
ORA-00907: missing right parenthesis
It seems that the DB does not accept the length of a field to be given in character
semantics. I have several sources that say it is possible, but is that
only possible in 11g?

According to the docs, NCHAR and NVARCHAR2 types are always character-based. So specifying in CHAR doesn't make sense explicitly.
http://download.oracle.com/docs/cd/B19306_01/server.102/b14225/ch3globenv.htm#sthref385
Cheers
Sarma.

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