Thank you, GenevaFlyer.
So my remaining question is: how is Premičre award inventory allocated?
Again, AF classifies Premičre awards as "Flex", and as far as I know the "Flex" Business class awards can be used on any flight where J space is still available (for double the miles of a "Classic" award ticket, of course).
I am assuming then that Premičre awards are the same as Flex Business awards as far as inventory goes, i.e. you can reserve a Premičre award ticket on any flight where P class is still open?