Rank function breaks drill down 11g

Question

I have a simple drill down report standard hierarchy and am having a weird issue with the rank function.
This report works on 10g but the upgraded 11g version does not.
When I drill down past the 2nd level it adds an is null filter to the revenue column.  This is also the column we are using to base our rank function.
If I move the rank column to the first or last position in the table the drills work perfectly.  If I move it to the second column it breaks on the first drill instead of the 2nd.
It works perfectly if drilling on the headings instead of the values.  That seems to point to some sort of null coming through when being passed.  I've tried using an ifnull and a case statement and neither method works, it just applies the is null filter to the entire column formula.
The client doesn't want to change the position of the rank column so that work around will not do.  Any ideas?

Answer 1

A similar thread was recently talked about here:
In OBIEE charts, how do you make drill downs work on custom formulas?
With a calculated column, you need to make sure the source query and destination query have the EXACT same formula and the same name for the field. If it is not 100% identical, it may not work correctly. (I typically use the NAVIGATE function to get to the second query rather than the Drill function.)
Now in some cases, if you try to create a second drill down query with more details in it, the original formula doesn't work the way you want it to. The calculated formulas have to make sense in both source query and destination query in order to work properly. If you have a ranking of the Top 5 Products in the source query, the destination query also has to have the same ranking of Top 5 products in order to work. If you add more fields into the destination query (e.g., adding on product attributes, or # of records associated with that product name etc.), then sometimes the ranking / aggregation in the destination doesn't add up the same way. This causes the system to think that the formulas are different and prevents the drill down.
I managed to get around this by having a 3rd query in between the original summary view and the detailed data view. So the sequence would be (for example):
- Dashboard based summary query (including the calculated ranked product names formula)
- drill down into virtually identical query (add on one slight bit of difference here, for example adding on a second Product Name field ... not a calculated version, but the actual name). Create a drill down this time by clicking on the regular Product Name field (don't drill down on the custom formula)
- final detailed drill-down query
You can format this intermediary drill down query to explain to users that they need to click a second time.
It's not ideal, but it should work. Hope this helps.
Ted