Delete button doesn't work in tabular form after upgrade from APEX3.2 to 4

I just upgraded the APEX from 3.2 to 4.0. However, my application is not working anymore.
First of all, my delete button in tabular form is not working. When I select a row and click the delete button, the row is not deleted, however the message showed 1 row is deleted.
Could you anybody tell me how can I debug this problem?
Thanks a lot !

I had the same problem. I first tried the solution above, but that didn't work. I also had a derived column for a custom popup and some display only columns. I removed the derived column and took out the display columns from my query. I then made sure my column order matched the source query. I applied changes and the delete button worked. FYI. I found out by some testing that it was actually trying to delete from the table, but with the wrong id. My first editable field was qty so if the qty was equal to 2 it then tried to delete from the table where pk=2(I had to restore that record). I believe it is related to the bug above. Backup your app first. I always do before I mess with the tabular forms.
Jeff

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