Can you please provide more information on this??? APEX Version?
How you created the report and form?
If you created the report and form using "Form on a Table with Report", Please check in your Form page whether you have Automated Row Fetch process in 'After Header'.
If you created the report and form separately means you need to create manual fetch process on the form page.
Please let me know the details. So that I can help you..
Also you need to check the item's data source to be Database Column and you have to provide the name of the column in caps. But like Lakshmi said, you need to have the Automated Row Fetch process in 'After Header'.
I created a report and form together but I had to change the primary key from the default ROWID to a new primary key. So I used the search function to change every reference to ROWID to the new primary key, including in the automated process. What is weird is that I only have this problem on this one report/form.