Confusing update issue!

Hello Group,  

Need an explanation for the following occurrence.

We have a large script doing approximately 2000 updates.

Within this script there is a update of a date column with a date such as '8-SEP-2004'  

i.e.  

update pm set pm15 = 'Y',pm1 = 'EMTR-C',crewid = 'CREW06',supervisor =
'6113603',pm4 = 'A',pmcounter = '2',pm13 = 'MON',firstdate =
'8-NOV-2004',nextdate = '8-NOV-2004' where pmnum = 'L1050216';
update pm set pm15 = 'Y',pm1 = 'EMTR-C',crewid = 'CREW06',supervisor =
'6113603',pm4 = 'A',pmcounter = '2',pm13 = 'MON',firstdate =
'8-NOV-2004',nextdate = '8-NOV-2004' where pmnum = 'L1050217';
update pm set pm15 = 'Y',pm1 = 'EMTR-C',crewid = 'CREW06',supervisor =
'6113603',pm4 = 'A',pmcounter = '3',pm13 = 'MON',firstdate =
'11-OCT-2004',nextdate = '11-OCT-2004' where pmnum = 'L1052951';
update pm set pm15 = 'Y',pm1 = 'EMTR-C',crewid = 'CREW06',supervisor =
'6113603',pm4 = 'A',pmcounter = '2',pm13 = 'MON',firstdate =
'20-SEP-2004',nextdate = '20-SEP-2004' where pmnum = 'L1052952';
update pm set pm15 = 'Y',pm1 = 'EMTR-C',crewid = 'CREW06',supervisor =
'6113603',pm4 = 'A',pmcounter = '2',pm13 = 'MON',firstdate =
'20-SEP-2004',nextdate = '20-SEP-2004' where pmnum = 'L1052953';

Once this script has been run, column firstdate will be updated to an arbitrary date like 20-SEP-2004 instead of 8-NOV-2004. Dates of more than two characters seem to work OK, ie '11-SEP-2004'.

I have tried alter session and setting nvl_date_format = 'DD-MON-YYYY'. Same thing.

A single row update, as in highlight one row and then execute works fine.

Run this script in different front ends including toad. Same thing.

I have tried placing a commit after each line same issue.

I have studied the triggers and procedures for some clue nothing, there is no reversing code.  

Has anyone experienced this before? Any explanations?

Is there something else I can try to debug this issue that I have not tried?  

Many Thanks

Denham

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