Record Updation Error in Tabular Form

Error in mru internal routine: ORA-20001: Error in MRU: row= 1, ORA-20001: ORA-20001: Current version of data in database has changed since user initiated update process. current checksum = "60B0A3BCA64C764FB47C46C02197B8A7", item checksum = "AB478B2987786CBC47D157BCDDF454AF"., update "DEMO"."BAK_SETUP" set "PHSICAL_NAME" = :b1, "START_TIME" = :b2, "END_TIME" = :b3, "INSTANCE" = :b4, "CONTENT" = :b5, "REMARKS" = :b6, "TAKEN_BY" = :b7

Dear ,
Yes, i am using Trigger to increment but my pk is S_NO and this increment via Sequence .
My Trigger
CREATE OR REPLACE TRIGGER "AR_LINEID_1_TRG"
   before insert or update on AR_INVOICE_DTL_1
   for each row
begin
if inserting and :new.LINE_ID is null then
SELECT LPAD(NVL(MAX(TO_NUMBER(SUBSTR(LINE_ID, -5))), 0)+1, 5, '0') INTO :NEW.LINE_ID FROM AR_INVOICE_DTL_1 WHERE INVOICE_NO=:NEW.INVOICE_NO;
end if;
    if inserting then
         :NEW.ENTERED_DATE := SYSDATE;
         :NEW.ENTERED_BY := nvl(v('APP_USER'),USER);
      end if;
      if updating then
         :NEW.MODIFIED_DATE := SYSDATE;
         :NEW.MODIFIED_BY := nvl(v('APP_USER'),USER);
      end if;
   end;
/is trigger Problem.
How to resolve it?
Thanks
Edited by: Vedant on Sep 4, 2011 10:20 PM

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Ora -20001 error coming while updating from a tabular form

Hi
I have a tabular form , which updates a table in the database.
Whenever I update the record first time I getting an error as
Error in MRU internal routine ORA-20001.Error in MRU:row=1,
ORA-1403 no_data_found, update abc.sale_forcast_temp set "PK_ID"=:b1,"W27"=:b2
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But when I press Ok return to the form and then again try to update , records gets successfully updated
Regards
Shashi

Kamal,
This will be the pseudocode.
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c is set to 0
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Record Updation Error in Tabular Form

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