Problem inserting auto-sequence for PK value using trigger - ORA-02287

Question

I have a query where the sub-query is working. I created a table to receive the results of the query. I created a Sequence:
CREATE SEQUENCE SEQ_RPT_H2_LOOPS
MINVALUE 1
START WITH 1
INCREMENT BY 1
NOMAXVALUE;
Then I created a trigger:
CREATE OR REPLACE TRIGGER TRG_RPT_H2_LOOPS
BEFORE INSERT ON RPT_H2_LOOPS
FOR EACH ROW
BEGIN
SELECT SEQ_RPT_H2_LOOPS.NEXTVAL INTO :NEW.RECORD_ID FROM DUAL;
END;
And here is the Insert query.
accept month_year;
accept prior_month_year;
insert into rpt_h2_loops (
     RECORD_ID,
     MKT_CODE,
     MKT_NAME,
     ECCKT,
     VENDOR_ID,
     ECCKT_VENDOR_ID,
     OCN,
     FAC_TYP,
     ALOC,
     ZLOC,
     STATE,
     OCN_STATE,
     OCN_STATE_COLO,
     SRVC_TYP,
     CUR_PERIOD,
     PRIOR_PERIOD,
     TIME_STAMP )
select seq_rpt_h2_loops.nextval
,substr(r.sub_acct,4,3)
,m.market
,rr.ckt
,rr.vendor_id
,rr.ckt||rr.vendor_id
,rr.ocn
,rr.srvc_typ
,'N/A'
,rr.zloc
,rr.st_cd
,rr.ocn||rr.st_cd
,rr.ocn||rr.st_cd||rr.zloc
,rr.srvc_typ
,'&month_year'
,'&prior_month_year'
,sysdate
from rco.rate_route rr
,rco.cogs_resource r
,rco.cogs_mkt m
where rr.cvbi_key = r.cvbi_key
and     m.subacct = r.sub_acct
and     to_char(rr.period, 'mm/yyyy') = '&month_year'
and     to_char(r.period, 'mm/yyyy') = '&month_year'
and     rr.srvc_typ = 'CUNE'
group by    substr(r.sub_acct,4,3)
,m.market
,rr.ckt
,rr.vendor_id
,rr.ckt||rr.vendor_id
,rr.ocn
,rr.srvc_typ
,rr.zloc
,rr.st_cd
,rr.ocn||rr.st_cd
,rr.ocn||rr.st_cd||rr.zloc
);The problem is that I am getting a ORA-02287: sequence number not allowed here on the NEXTVAL keyword.
The sequence and trigger compiled without problem. I just can't seem to insert that value into the query. Any help would be appreciated.

Answer 1

you are defeating the purpose of trigger which is before insert so just rewrite the query and remove the column for which value will be inserted using the created sequence and your code will work.
Regards,
Vikas Kumar