The reports in Oracle Designer leave a lot to be desired. I think there is too much detail for a programmer. However, they are useful for giving to users and filling up notebooks for managers. For some reason, Oracle doesn't seem to care about getting data out.
If you don't like the reports, Oracle recommends you open the report file in Developer and change it yourself. That's what I did to figure out which tables to use and how they were connected so I could write my own queries.
Here is the info I discovered: