I found ORA-00001 ERROR but there is not Unique Constraint or Primary key

Question

Tell me is the error in following code
declare
     cursor c1 is
     select a.cust_no as loan_id,a.cust_no as instrf,152 as l_code,cor_brwr,
     a.name,21 as pro_id,FRST_CT_DT,
     ADD_MONTHS(C.ct_DaTe,c.PERIOD_MM)as maturity,'S'as secured,irr as IRATE,
     'HEAD OFFICE'AS branch_id,'F'as FACNAT,lease_amt as tlimit
     from      cu_customer a ,cor_brwr b ,le_contract c
     where a.name=b.name
     and a.cust_no=c.cust_no
          and c.ct_no in (select ct_no from le_contract d
     where cust_no=a.cust_no
     and 
(DISB_POST_DT IS NOT NULL OR DISB_POST_DT<=:dated)
AND (TERM_TYPE IS NULL)
OR (TERM_TYPE='T'
AND TERM_POST_DT IS NULL OR TERM_POST_DT>=:dated)
OR (TERM_TYPE='M' AND TERM_DATE IS NULL OR TERM_DATE>=:dated)
begin
     for a in c1 loop
          insert into cor_loan
          (loan_id,instrf,LCOD,cor_brwr,name,PROD_ID,ldate,maturity,secured,irate,branch_Id, FACNAT)
          values (a.loan_id,a.instrf,a.l_code,a.cor_brwr,a.name,a.pro_id,a.FRST_CT_DT,a.maturity,a.secured,a.irate,a.branch_id,a.FACNAT);
     end loop;
commit;
end;

Answer 1

Hi,
can you provide the results of the above query ?
select  owner, constraint_name, constraint_type
from all_constraints
where table_name = 'COR_LOAN'and
select  owner, constraint_name, constraint_type
from user_constraints
where table_name = 'COR_LOAN'Regards
JeanYves