You can't put BeoSound1 in option 0 as it is not a BeoLink product and cannot be programmed.
You could try putting BeoCenter6 into option 4. You will need to add "Link" to the list button of Beo4 if you have one. Failing that the Beo5 will need amending to send out the "Link" command when you want to operate the Beocenter6.
If you don't send the link command, the BeoSound1 will respond and BeoCenter6 will do nothing. I think ;-)
Opman