ERROR at line 1: ORA-12054: cannot set the ON COMMIT refresh attribute for the materialized view

SQL> select * from ii;

         N V
---------- --------
         1 a
         2 b
         3 c

SQL> alter table ii add constraint ii_p primary key(n);

Table altered.

SQL> create materialized view v_ii refresh force on commit as select * from ii;

Materialized view created.

SQL>