Oracle DB ver. for ECC 6.0

Hi,

We are just in the planning for doing an upgrade from

4.6C to ECC 6.0.

Our 4.6C is running on Windows and with an Oracle DB(9.2.0.7), kernelrelese is 6.20.

The question is now, must we upgrade the DB to 10.2 or is this just "best practice". I have not found any document stating that version 10.2 is a must for ECC 6.0. Does anyone have any info about this.

Thanks!

Fred