Inventory Cube Problems

Hi,

I am using stocks cube. The issue i am facing is that values ( Both quantities and Values of Stocks) for some Material Plant comibination are correct. I am comparign query results with Mc.1 report and MB5B report in r/3. The current stock level quanties are perfect but for some materials historical values both quantities and values are not matching.

Can anyone suggest what can be the reason. I am using quality server R/3 where we are having 3-4 months of production data. Can it be one of the reasons.

Guys please suggest what can be done