How to Use Sequence in Oracle Views

Hi ,
I have created a view which gives the information about the access rights which a Resource has got. for ex -
Res1 - GYM access - member
Res1 - Swimingpool Access - member
I need to identify a Primary Key for this data set. So i thought that i'll use a Sequence to generate an extra column in this view.
But when i'm using the Sequence i'm getting the following error - "ORA-02287".

you can use sequence within view it doesnot returned error;
create sequence t1_seq MAXVALUE 150
START WITH 39 INCREMENT BY 1;
SQL> insert into t1_view values(t1_seq.nextval,'dd');
1 row created.
SQL> commit;
Commit complete.
SQL> select * from t1;
ID NA
10 aa
20 bb
30 cc
40 dd
4 rows selected.
SQL> insert into t1_view values(t1_seq.nextval,'ee');
1 row created.
SQL> commit;
Commit complete.
SQL> select * from t1;
ID NA
10 aa
20 bb
30 cc
40 dd
41 ee
5 rows selected.

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