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If you try update the same data from 2 places you will got this message because:
Apex forms have locking mechanism.
1. During fetch data to form apex calculate checksum from every items on the forms.
2. Before update process apex again fetch data from database (in background) and calculate checksum again if checksum from point 1 is the same like this checksum APEX realy update data with new item values. If no, You will got your error (apex secure You, You realy don't know what you update).
According this if you change data which you use in the form between 1 and 2 point you will got this "error". You can check it for example if you change data from SQL/Plus or from other form.
Probably you forget about this locking mechanism during designe your process from APEX API <- successfully update records (maybe successful but you don't know what you updated) : )
If I helped You please check correct or helpful :)
Thank you for your reply.
"If you try update the same data from 2 places you will got this message"
I am fully aware of and familiar with Oracle's and APEX's locking strategies. My application is in development and I am the only person working on it and the underlying tables. So, there is no contention between me an another user.
I know this error has do do with me having two regions on the page, because when I create just the tabular form on a separate page I do not get this error.
Again, thanks for the reply. Anyone else?