Consumed quantity is still 0 in Source Allocation........!!

DEAR GURUS,

             Am working in AFS 6.0 system,and am facing the problem in the area source allocation.

Actually i have done the necessary configuration in Source Allocation area as per the standard and P.R is also allocated to the source exactly as per the configuration i did. Then i also had set the consumption point as P.R in the settings for source allocation control.The problem is, even after processing PR into PO and till GR is over the consumed quantity of vendor is still showing as 0.I don't know where i left the customization if any.

        Could  you please help me to overcome this problem.

Thanks in advance

Naveen