Error in tabular form

On a wizard generated tabular form on a table, I keep getting
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.
when I click the Apply Changes button.
The data has definitely not changed.
How do I go about troubleshooting this? I did add some derived fields to the SQL query that the wizard generated, but they are not Editable, they are read-only fields.
I am at my wits end.
Thanks

Marc:
I did the latter thing. I started with the wizard generated form, made sure it was working and added my changes one at a time, keeping my fingers crossed after each change! Its still fine.
<rant>
See the frustrating thing about the MRU error is that it gives absolutely no indication as to what the real problem is, it doesnt help to fix it. So basically one has to "backtrack" all the way to the beginning, the same way I did above i.e. start all over again. Its very time-consuming and counter-productive.
</rant>
Marc: Is there a way you can basically prevent changes to the wizard-generated form that would make it "not work" anymore?
Thanks

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Roel
http://roelhartman.blogspot.com/
You can reward this reply by marking it as either Helpful or Correct ;-)

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Dear ,
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Bump. I'm having the same issue. Any answers out there???

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http://www.opal-consulting.de/training
http://htmldb.oracle.com/pls/otn/f?p=31517:1
-------------------------------------------------------------------

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First post :)
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