Subquery over a subquery is not allowed?

Question

I am trying to create subquery over another sheet which is a subquery itself, but it seems it is not allowed.
I have the original sheet S1(A,B,C) with the items A,B,C. I create a new sheet S2(A,B,C,D) and I add an item D with the condition that the value of D is equal to the value of the item B of the original, so I create the following condition with a subquery, S2.D=S1.B. Until here everything goes fine.
Then I want to create a new sheet S3(A,B,C,D) with the condition S3.D=S2.D. The problem is that the sheet S2 does not appear in the dialog where I should select the subquery sheet. Only the S1 appears.
Is there anything I can do about it?
Thank you in advance for any help.
Th.D.

Answer 1

Try creating the report in one go...
Instead of creating a subquery, and then a subquery using that subquery, and finally a "master" query, create the "master" query first, and within the conditions, create your subquery as you go along.
I'm not sure whether this would work, as I don't currently have access to Discoverer!
Alternatively, subqueries are rarely the most efficient way of processing information, so consider writing a PL/SQL function to do some of the work for you.