Page 1 of Sony GX300 - can it record widescreen on DVD+R and DVD+RW?

I have just bought a Sony GX300 dvd recorder, which supports +R +RW -R and -RW

However it states in the manual that 16:9 recordings are only supported on -R and -RW discs. Is this really the case?

I was hoping to use +R and +RW discs as this is the same as my home PC uses.

Anyone know if you can record widescreen on this machine on +R or +RW?

This is quite weird.

Tried recording widescreen on -R disc - and this was fine.

Also tried recording widescreen on +R disc (which manual says is not possible) - and this also seems fine.

Am I missing something? Both the -R and +R seem to play back the widescreen from my sky+ box recordings successfully - so they do sony say in the manual that it cannot on +R discs. Am I missing something?