What is #NUM! value in Discoverer?

[jscrunch]

Hi friends,
[Disco 10.1.2.2 - Desktop 10.1.2.54.25 - DB: 9.2.0.8]
I've just migrated from disco 4i to disco 10. For some reports with aggregation values, disco 10 shows values wrong. To correct the failure, I've unchecked in Tools Menu->aggregation tab the "Use the aggregation behavior selected by the Discoverer manager" option. The option now is the "Show N.A. ..."
The problem is that for certain reports, it appear the value #NUM! in aggregation cells and in totals.
I've searched a lot about migraiton problems and I've a SR opened in metalink with this problem for 2 months... but without clarify at all...
Help please... Ideas?

[I've tried to chage the format of cells to all type of format data, but in certain reports it doesn't work and the #NUM! value continues there... For total values.. I have no possibility of change format so.. what to do