Book qty in MI20 report

Hi all,

Count date - 1st Sep 2009

Posting date - 1st Sep 2009

Document date - 1st Sep 2009

Stocks as on 3st Aug 2009 - 31 Ea When i run MI20 report now,

I am getting book qty as zero. But there were stocks as on end Aug 2009.

What could be the reason?