Availability check in PM orders

Hi Gurus,

I have a weird situation with the PM ATP availability check in PM. I have done the customizing steps with tcodes OPJK and OPPJ (only considers safety stock & Reservations). Availability check "02" in material master. But when i run the availability check on a newly created material which obviousvly doesn't have any stock, it is checked as available. and the required quantity is confirmed however big it is... Same thing happen in CO09 with the checking rule i use, EVERYTHING is being confirmed despite there is no stock. Anything special about PM availability check ? Any idea what i should check ?

Cheers,

Olivier