What led you discover that the problem was with quantities? The verbose report only gives me the error count.
I have approximately 1600 different items on open purchase orders. This makes a comparison between IC quantities on order and IR quantities on order difficult. I suppose it would be possible to write a Quick Report but with the 50,000 item IC file I have it would be very time consuming.
Neither WSM nor DataCare on a single start list entry detect the problem.