Problem (bug?) in report - sort

Question

I receive this error:
failed to parse SQL query:
ORA-06502: PL/SQL: numeric or value error: NULL index table key value
I know where this comes from, but I don't know how to solve it (the first time). Below how you can reproduce my error.
Test-case:
1. Create a page with a form with one field, static value 1;
2. Add to that page a report with select id, column from table where id = :p1_x; Make the columns sortable.
3. Add to that page an other report with select id, column from table2 where id = :p1_x; Make the columns sortable.
4. If you run the page, you see the form with the item (value 1) and the 2 report with the right results (1 row; id=1)
5. After Sorting on a column of one of the reports, you receive the error on the other report.
When you rerun the page and do the sort also on the other report, the error is gone (for that user).
So to resolve my issue, I need to login with every user, do the sort on all the reports and then I don't have the error.
How can I do it simpler, so that I don't have this error anymore?

Answer 1

Dimitri,
I reviewed your application and found what's causing your sorting issue. When using column heading sorting, you can choose the columns for which you want to enable sorting. This selection is done on the report attributes page. Next to the sort flag, you'll find the "sort sequence" attribute. That attribute allows you to define the default sort sequence for your report. When having column heading sorting enabled, you need to set the sort sequence for at least one column. So to fix your issue, edit both reports and set the sort sequence for e.g. the first column to 1.
Regards,
Marc